Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...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>

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
         runs-on: ${{ matrix.os }}
         steps:
             - name: Checkout code
-              uses: actions/checkout@v4
+              uses: actions/checkout@v6
             - name: Install rust
               id: rust
               uses: dtolnay/rust-toolchain@stable
@@ -83,7 +83,7 @@ jobs:
               id: tag_name
               run: echo "current_version=${GITHUB_REF#refs/tags/v}" >> "$GITHUB_OUTPUT"
             - name: Checkout code
-              uses: actions/checkout@v4
+              uses: actions/checkout@v6
             - name: Get Changelog Entry
               id: changelog_reader
               uses: mindsers/changelog-reader-action@v2