Bump coverallsapp/github-action from 2.1.2 to 2.2.1 (#341)

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 2.1.2 to 2.2.1.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](f350da2c03...95b1a2355b)

---
updated-dependencies:
- dependency-name: coverallsapp/github-action
  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>

.github/workflows/unit_tests.yaml

@@ -23,7 +23,7 @@ jobs:
     - name: Convert coverage to lcov
       uses: jandelgado/gcov2lcov-action@c680c0f7c7442485f1749eb2a13e54a686e76eb5
     - name: Coveralls
-      uses: coverallsapp/github-action@f350da2c033043742f89e8c0b7b5145a1616da6d
+      uses: coverallsapp/github-action@95b1a2355bd0e526ad2fd62da9fd386ad4c98474
       with:
         github-token: ${{ secrets.github_token }}
         path-to-lcov: coverage.lcov