Bump Chizkiyahu/delete-untagged-ghcr-action from 5.0.0 to 6.0.0

Bumps [Chizkiyahu/delete-untagged-ghcr-action](https://github.com/chizkiyahu/delete-untagged-ghcr-action) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/chizkiyahu/delete-untagged-ghcr-action/releases)
- [Commits](Chizkiyahu/delete-untagged-ghcr-action@1c77a06...4a33ce3)

---
updated-dependencies:
- dependency-name: Chizkiyahu/delete-untagged-ghcr-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/delete_untagged_containers.yml

@@ -19,7 +19,7 @@ jobs:
     if: github.repository == 'OSGeo/gdal'
     steps:
     - name: Delete all containers from gdal-deps without tags
-      uses: Chizkiyahu/delete-untagged-ghcr-action@1c77a06b7f80ad4beb82b85919003831d47277d1 # v5.0.0
+      uses: Chizkiyahu/delete-untagged-ghcr-action@4a33ce3cf2456d2aef98a1b6c60a12dad56cffd9 # v6.0.0
       with:
         token: ${{ secrets.PAT_TOKEN_DELETE_UNTAGGED_CONTAINERS }}
         repository_owner: ${{ github.repository_owner }}