Replace git-auto-commit-action with native git commands

Fixes zizmor warning about using action functionality that is already
included by the runner.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: duncanmcclean

.github/workflows/pint-fix.yaml

@@ -24,12 +24,14 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: ${{ github.head_ref }}
-          persist-credentials: false
 
       - name: Fix PHP code style issues
         uses: aglipanci/laravel-pint-action@36de00d5f5a8a4e12d443e01671daa12a18f4c79 # 2.6
 
       - name: Commit changes
-        uses: stefanzweifel/git-auto-commit-action@04702edda442b2e678b25b537cec683a1493fcb9 # v7.1.0
-        with:
-          commit_message: Fix styling
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add -A
+          git diff --staged --quiet || git commit -m "Fix styling"
+          git push