⬆️ Update actions/checkout action to v3.6.0

Author: renovate[bot]

.github/workflows/hassfest.yaml

@@ -11,5 +11,5 @@ jobs:
   validate_hassfest:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: "actions/checkout@v3.0.2"
+      - uses: "actions/checkout@v3.6.0"
       - uses: home-assistant/actions/hassfest@master