Bump coverallsapp/github-action from 2.2.3 to 2.3.0

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 2.2.3 to 2.3.0.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](coverallsapp/github-action@3dfc556...643bc37)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/cov.yaml

@@ -43,7 +43,7 @@ jobs:
       - name: Coveralls
         # Use commit hash here to avoid a re-tagging attack, as this is a third-party action
         # Commit 3dfc5567390f6fa9267c0ee9c251e4c8c3f18949 = tag v2
-        uses: coverallsapp/github-action@3dfc5567390f6fa9267c0ee9c251e4c8c3f18949
+        uses: coverallsapp/github-action@643bc377ffa44ace6394b2b5d0d3950076de9f63
         with:
           github-token: ${{ secrets.github_token }}
           file: src/github.com/nats-io/nats-server/coverage.lcov