Build(deps): Bump async from 2.6.3 to 2.6.4 in /pinry-spa

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v2.6.3...v2.6.4)

---
updated-dependencies:
- dependency-name: async
  dependency-type: indirect
...

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

pinry-spa/yarn.lock

@@ -1306,8 +1306,9 @@ async-limiter@~1.0.0:
   resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
 
 async@^2.6.2:
-  version "2.6.3"
-  resolved "https://registry.npm.taobao.org/async/download/async-2.6.3.tgz?cache=0&sync_timestamp=1563385399810&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fasync%2Fdownload%2Fasync-2.6.3.tgz#d72625e2344a3656e3a3ad4fa749fa83299d82ff"
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"
+  integrity sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==
   dependencies:
     lodash "^4.17.14"