Bump EndBug/add-and-commit from 7 to 8 (open-telemetry#5190)

Bumps [EndBug/add-and-commit](https://github.com/EndBug/add-and-commit) from 7 to 8.
- [Release notes](https://github.com/EndBug/add-and-commit/releases)
- [Changelog](https://github.com/EndBug/add-and-commit/blob/main/CHANGELOG.md)
- [Commits](EndBug/add-and-commit@v7...v8)

---
updated-dependencies:
- dependency-name: EndBug/add-and-commit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/nightly-benchmark-overhead.yml

@@ -30,7 +30,7 @@ jobs:
       - name: copy results back to gh-pages branch
         run: rsync -avv benchmark-overhead/results/ gh-pages/benchmark-overhead/results/ && rm -rf benchmark-overhead/results
       - name: commit updated results
-        uses: EndBug/add-and-commit@v7
+        uses: EndBug/add-and-commit@v8
         with:
           add: 'benchmark-overhead/results'
           cwd: './gh-pages'