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/check.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
     - name: Set Git's core.autocrlf to false for Windows before checkout
       run: git config --global core.autocrlf false
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up OpenJDK 8
       uses: actions/setup-java@v5
       with:

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: true
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up OpenJDK 8
       uses: actions/setup-java@v5
       with: