Bump ad-m/github-push-action

Bumps [ad-m/github-push-action](https://github.com/ad-m/github-push-action) from 9870d48124da805820c70ebc6ba563c715551019 to 77c5b412c50b723d2a4fbc6d71fb5723bcd439aa.
- [Release notes](https://github.com/ad-m/github-push-action/releases)
- [Commits](ad-m/github-push-action@9870d48...77c5b41)

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

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

.github/workflows/docs.yml

@@ -102,7 +102,7 @@ jobs:
 
       - name: Push changes
         if: ${{ env.HAS_CHANGES == 'true' }}
-        uses: ad-m/github-push-action@9870d48124da805820c70ebc6ba563c715551019
+        uses: ad-m/github-push-action@77c5b412c50b723d2a4fbc6d71fb5723bcd439aa
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           branch: gh-pages