Bump coverallsapp/github-action from 1.1.3 to 2.1.2

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 1.1.3 to 2.1.2.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](coverallsapp/github-action@9ba913c...f350da2)

---
updated-dependencies:
- dependency-name: coverallsapp/github-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/test-package.yml

@@ -73,7 +73,7 @@ jobs:
       - name: Collect and report coverage
         run: dart run bin/test_with_coverage.dart --port=9292
       - name: Upload coverage
-        uses: coverallsapp/github-action@9ba913c152ae4be1327bfb9085dc806cedb44057
+        uses: coverallsapp/github-action@f350da2c033043742f89e8c0b7b5145a1616da6d
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           path-to-lcov: coverage/lcov.info