Bump actions/checkout from 4 to 6 (#11)

Author: dependabot[bot]

.github/workflows/format.yaml

@@ -12,6 +12,6 @@ jobs:
     name: pre-commit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
       - uses: pre-commit/action@v3.0.1