chore(deps): update actions/checkout action to v4.2.1

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

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
       RENOVATE_CONFIG_FILE: ${{ matrix.file }}.json
 
     steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
 
       - name: testing ${{ matrix.file }}
         run: npx -p renovate renovate-config-validator