Bump coverallsapp/github-action from 1 to 2

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 1 to 2.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Upgrade guide](https://github.com/coverallsapp/github-action/blob/main/UPGRADE.md)
- [Commits](coverallsapp/github-action@v1...v2)

---
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>

.github/workflows/unit-tests.yml

@@ -96,6 +96,6 @@ jobs:
 
     steps:
       - name: Complete parallel builds
-        uses: coverallsapp/github-action@v1
+        uses: coverallsapp/github-action@v2
         with:
           parallel-finished: true