USe pmd-bot's identity for commits

Author: adangel

.github/workflows/check-changelog.yml

@@ -47,6 +47,6 @@ jobs:
       - name: Push changes to CHANGELOG.md
         if: ${{ github.repository == 'pmd/pmd-github-action' && env.changelog == 'outdated' }}
         run: |
-          git config --local user.email "<>"
-          git config --local user.name "GitHub Actions Bot"
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Actions (pmd-bot)"
           git add CHANGELOG.md && git commit -m 'Updated CHANGELOG.md' && git push origin main