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)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@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>

Author: dependabot[bot]

.github/workflows/automatic-release.yaml

@@ -22,7 +22,7 @@ jobs:
     outputs:
       labels: ${{ steps.match-label.outputs.match }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - id: match-label
         shell: bash
         run: |

.github/workflows/release.yaml

@@ -29,7 +29,7 @@ jobs:
       packages: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Set up Docker Buildx
       - name: Set up Docker Buildx
@@ -96,7 +96,7 @@ jobs:
     needs: manifest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: marvinpinto/action-automatic-releases@latest
         with:
@@ -112,7 +112,7 @@ jobs:
     needs: release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Create release branch
         run: git checkout -b release/${{ inputs.version }}