chore(deps): 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)
- [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/auto-tag.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6.0.1
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Need full history for git describe
 

.github/workflows/docusaurus.yml

@@ -29,7 +29,7 @@ jobs:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Needed for version timestamps
 

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
       version: ${{ steps.tag.outputs.version }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6.0.1
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -106,7 +106,7 @@ jobs:
     needs: sync-manifest  # Wait for manifest sync to complete
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6.0.1
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Fetch all history for git-cliff
           ref: main  # Use updated main branch if manifest was synced