Update actions/checkout action to v4.2.1

| datasource  | package          | from   | to     |
| ----------- | ---------------- | ------ | ------ |
| github-tags | actions/checkout | v4.2.0 | v4.2.1 |

.github/workflows/continuous-integration.yml

@@ -14,7 +14,7 @@ jobs:
     name: PHPUnit Coverage
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/[email protected].0
+      - uses: actions/[email protected].1
       - uses: shivammathur/[email protected]
         with:
           php-version: 8.1
@@ -38,7 +38,7 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
-      - uses: actions/[email protected].0
+      - uses: actions/[email protected].1
       - uses: shivammathur/[email protected]
         with:
           php-version: 8.1