Bump actions/checkout from 5 to 6 (#655)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/deploy.yml

@@ -11,9 +11,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out docs
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Check out website
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: dita-ot/website
           token: ${{ secrets.COMMITTER_TOKEN }}

.github/workflows/gradle-wrapper-validation.yml

@@ -9,5 +9,5 @@ jobs:
     name: 'Validation'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/wrapper-validation@v5

.github/workflows/prettier.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # Make sure the actual branch is checked out when running on pull requests
           ref: ${{ github.ref }}

.github/workflows/preview.yml

@@ -17,9 +17,9 @@ jobs:
       WEBSITE_BRANCH: 'master'
     steps:
       - name: Check out docs
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Check out website
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: dita-ot/website
           ref: ${{ env.WEBSITE_BRANCH }}

.github/workflows/release.yml

@@ -35,7 +35,7 @@ jobs:
             echo "TAG=${{ github.event.inputs.docs-tag }}" >> $GITHUB_ENV
           fi
       - name: Check out docs
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.TAG }}
       - name: Set variables
@@ -48,7 +48,7 @@ jobs:
           java-version: 17
           cache: 'gradle'
       - name: Check out website
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: dita-ot/website
           token: ${{ secrets.COMMITTER_TOKEN }}
@@ -120,7 +120,7 @@ jobs:
             echo "RELEASE_VERSION=${{ github.event.inputs.dita-ot-version }}" >> $GITHUB_ENV
           fi
       - name: Check out docs
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: develop
       - name: Update GitHub Actions release workflow