Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/checks.yaml

@@ -22,6 +22,6 @@ jobs:
         with:
           go-version: ${{ env.GO_VERSION }}
           cache: false
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: lint
         uses: golangci/golangci-lint-action@v6

.github/workflows/release.yaml

@@ -23,7 +23,7 @@ jobs:
           go-version: ${{ env.GO_VERSION }}
           check-latest: true
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - id: set_version
         run: |
           VERSION=$(echo $GITHUB_REF | sed -nE 's!refs/tags/!!p')