Bump actions/checkout from 4.1.3 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.3 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@v4.1.3...v4.2.1)

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

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

.github/workflows/ci.yml

@@ -10,15 +10,15 @@ jobs:
   check-links:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4.1.3
+      - uses: actions/checkout@v4.2.1
       - uses: lycheeverse/[email protected]
         with:
           fail: true
 
   make:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4.1.3
+    - uses: actions/checkout@v4.2.1
     - uses: actions/[email protected]
       with:
         go-version: '1.22'
@@ -33,7 +33,7 @@ jobs:
         - '1.22'
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4.1.3
+    - uses: actions/checkout@v4.2.1
     - uses: actions/[email protected]
       with:
         go-version: ${{ matrix.go-version }}