Bump actions/checkout from 4.2.0 to 4.2.1 (#392)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/lighthouse-on-vercel-preview-url.yml

@@ -21,7 +21,7 @@ jobs:
           # find project id here: https://vercel.com/darkroom-engineering/satus/settings
           vercel_team_id: 'darkroom-engineering'
           vercel_project_id: ${{ secrets.VERCEL_PROJECT_ID }}
-      - uses: actions/checkout@v4.2.0
+      - uses: actions/checkout@v4.2.1
       - name: Audit preview URL with Lighthouse
         id: lighthouse_audit
         uses: treosh/lighthouse-ci-action@v12