deps: bump actions/checkout from 4.2.0 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       image-digest: ${{ steps.image-info.outputs.image_digest }}
     steps:
       - name: Checkout source code
-        uses: actions/[email protected].0
+        uses: actions/[email protected].1
 
       - name: Set up Carvel
         uses: carvel-dev/[email protected]