Bump coverallsapp/github-action from 1.2.4 to 2.1.0

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 1.2.4 to 2.1.0.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](coverallsapp/github-action@v1.2.4...v2.1.0)

---
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>

CLA: trivial

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #20699)

.github/workflows/coveralls.yml

@@ -68,7 +68,7 @@ jobs:
     - name: generate coverage info
       run: lcov -d . -c -o ./lcov.info
     - name: Coveralls upload
-      uses: coverallsapp/github-action@v1.2.4
+      uses: coverallsapp/github-action@v2.1.0
       with:
         github-token: ${{ secrets.github_token }}
         git-branch: ${{ matrix.branches.branch }}