Update actions/checkout action to v4.2.1

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


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/renovate-build.yml

@@ -26,7 +26,7 @@ jobs:
     if: ${{ github.actor == 'renovate[bot]' }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
 
       - name: Check for changes
         uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
@@ -46,7 +46,7 @@ jobs:
     if: ${{ needs.check.outputs.generate == 'true' }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
         with:
           ref: ${{ github.head_ref }}
           token: ${{ secrets.NGINX_PAT }}