Update actions/checkout action to v6.0.3

Author: renovate[bot]

.github/workflows/autofix.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6.0.2
+        uses: actions/checkout@v6.0.3
         with:
           fetch-depth: 0
       - name: Setup Tools