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-md-links.yml

@@ -7,7 +7,7 @@ jobs:
     name: 'Check Markdown links'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: umbrelladocs/action-linkspector@v1.4.0
         with:
           github_token: ${{ secrets.github_token }}

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     name: on ${{ matrix.platform }} with JDK ${{ matrix.jdk }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ matrix.jdk }}
         uses: actions/setup-java@v5
         with:

.github/workflows/codeql.yml

@@ -23,7 +23,7 @@ jobs:
         language: [ java ]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Java
         uses: actions/setup-java@v5

.github/workflows/coverage.yml

@@ -13,7 +13,7 @@ jobs:
     name: Create and upload coverage report
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK 21
         uses: actions/setup-java@v5
         with:

.github/workflows/quality-monitor-build.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up JDK
         uses: actions/setup-java@v5
         with:

.github/workflows/quality-monitor-comment.yml

@@ -26,7 +26,7 @@ jobs:
           sha='${{ github.event.workflow_run.head_sha }}'
             echo "sha=$sha" >> "$GITHUB_OUTPUT"
       - name: Checkout PR
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ steps.pr.outputs.sha }}
       - name: Download PR Quality Reports from Quality Monitor Build workflow

.github/workflows/sync-labels.yml

@@ -13,7 +13,7 @@ jobs:
     name: Sync labels
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: micnncim/action-label-syncer@v1.3.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}