Update actions/checkout action to v4.2.0

| datasource  | package          | from   | to     |
| ----------- | ---------------- | ------ | ------ |
| github-tags | actions/checkout | v4.1.7 | v4.2.0 |

.github/workflows/continuous-integration.yml

@@ -23,7 +23,7 @@ jobs:
     name: "Check for missing dependencies"
     runs-on: "ubuntu-latest"
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.0
       - uses: shivammathur/[email protected]
         with:
           php-version: 8.1