Bump actions/checkout from 4.1.6 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.6 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@v4.1.6...v4.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         version: ["1.20", "1.21", "1.22"]
     steps:
-      - uses: actions/checkout@v4.1.6
+      - uses: actions/checkout@v4.2.1
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.version }}
@@ -30,7 +30,7 @@ jobs:
     name: Benchmark
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.1.6
+      - uses: actions/checkout@v4.2.1
       - uses: actions/setup-go@v5
       - uses: actions/setup-go@v5
         with:
@@ -42,7 +42,7 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.1.6
+      - uses: actions/checkout@v4.2.1
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6.1.0
         with: