chore(deps): update actions/checkout action to v6

.gitea/workflows/lint.yaml

@@ -9,7 +9,7 @@ jobs:
     name: pre-commit Linting
     runs-on: pi
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
     - run: pip install pre-commit
       shell: bash