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

Author: renovate[bot]

.github/workflows/generate.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@v6.0.0
       - name: Setup Python
         uses: actions/setup-python@v4.9.1
         with: