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] <[email protected]>

Author: dependabot[bot]

.github/workflows/cd.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Configure JDK
         uses: actions/setup-java@v5
         with:

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     name: "Validate Gradle Wrapper"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/wrapper-validation@v5
   build:
     name: Build on ${{ matrix.os.runner }}
@@ -39,7 +39,7 @@ jobs:
             mingw-w64-x86_64-cmake
             mingw-w64-x86_64-extra-cmake-modules
             mingw64/mingw-w64-x86_64-cyrus-sasl
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Restore native cache
         id: cache-native

.github/workflows/github-pages.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: macos-latest # For Kotlin/Native
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Configure JDK
         uses: actions/setup-java@v5