Bump ad-m/github-push-action from 0.6.0 to 0.8.0

Bumps [ad-m/github-push-action](https://github.com/ad-m/github-push-action) from 0.6.0 to 0.8.0.
- [Release notes](https://github.com/ad-m/github-push-action/releases)
- [Commits](ad-m/github-push-action@v0.6.0...v0.8.0)

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

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

.github/workflows/test262.yml

@@ -114,7 +114,7 @@ jobs:
           cd ..
       - name: Upload results
         if: github.event_name == 'push'
-        uses: ad-m/github-push-action@v0.6.0
+        uses: ad-m/github-push-action@v0.8.0
         with:
           directory: gh-pages
           branch: gh-pages