The README claims that Python 3.7 or higher is required,
so I believe it would be nice to ensure that all 3.7+
versions are actually supported by enabling testing
against them on CI.

These changes also:
  - add coverage reporting
  - disable the fail-fast mode for tests
  - make CI use pipx to install poetry
  - make CI use pytest to run tests
  - force colors on CI
  - bump actions/checkout to v4
  - bump actions/setup-python to v5

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.2.0 to 7.3.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/7.2.0...7.3.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.0.1 to 7.2.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/7.0.1...7.2.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [jinja2](https://github.com/pallets/jinja) from 3.0.1 to 3.1.2.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/3.0.1...3.1.2)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.19.1 to 0.20.1.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/CHANGES.rst)
- [Commits](https://github.com/xflr6/graphviz/compare/0.19.1...0.20.1)

---
updated-dependencies:
- dependency-name: graphviz
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [black](https://github.com/psf/black) from 22.10.0 to 22.12.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/compare/22.10.0...22.12.0)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.1 to 7.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/6.2.1...7.0.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.17 to 0.19.1.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/CHANGES.rst)
- [Commits](https://github.com/xflr6/graphviz/compare/0.17...0.19.1)

---
updated-dependencies:
- dependency-name: graphviz
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.3 to 3.0.1.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.11.3...3.0.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.16 to 0.17.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/CHANGES.txt)
- [Commits](https://github.com/xflr6/graphviz/compare/0.16...0.17)

---
updated-dependencies:
- dependency-name: graphviz
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.4.4 to 2.7.0.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](https://github.com/PyCQA/pylint/compare/pylint-2.4.4...pylint-2.7.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.1 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.11.1...2.11.3)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.15 to 0.16.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/CHANGES.txt)
- [Commits](https://github.com/xflr6/graphviz/compare/0.15...0.16)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.10.1 to 6.2.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/3.10.1...6.2.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.13.2 to 0.15.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/CHANGES.txt)
- [Commits](https://github.com/xflr6/graphviz/compare/0.13.2...0.15)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>