fix: resolve GitHub Actions permissions for auto-generated vimdoc

- Add contents: write permissions to docs workflow
- Update checkout and git-auto-commit-action to latest versions
- Fix 403 permission denied error when pushing vimdoc changes

Author: abreujp

.github/workflows/docs.yml

@@ -7,8 +7,12 @@ name: docs
 jobs:
   docs:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
       - name: panvimdoc
         uses: kdheepak/panvimdoc@main
         with:
@@ -17,9 +21,6 @@ jobs:
           demojify: true
           treesitter: true
       - name: Push changes
-        uses: stefanzweifel/git-auto-commit-action@v4
+        uses: stefanzweifel/git-auto-commit-action@v5
         with:
           commit_message: "auto-generate vimdoc"
-          commit_user_name: "github-actions[bot]"
-          commit_user_email: "github-actions[bot]@users.noreply.github.com"
-          commit_author: "github-actions[bot] <github-actions[bot]@users.noreply.github.com>"