Add permissions

.github/workflows/black.yml

@@ -17,6 +17,10 @@ concurrency:
 jobs:
   lint:
     runs-on: ubuntu-latest
+    permissions:
+      # Give the default GITHUB_TOKEN write permission to commit and push the
+      # added or changed files to the repository.
+      contents: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4