Bump vlaurin/action-ghcr-prune from 0.5.0 to 0.6.0 (#869)

Bumps [vlaurin/action-ghcr-prune](https://github.com/vlaurin/action-ghcr-prune) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/vlaurin/action-ghcr-prune/releases)
- [Commits](vlaurin/action-ghcr-prune@v0.5.0...v0.6.0)

---
updated-dependencies:
- dependency-name: vlaurin/action-ghcr-prune
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matthias Pfeil <matthias.pfeil@wwu.de>

.github/workflows/registry-purge-pr.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 💣 Purge Pull Request Image
-        uses: vlaurin/action-ghcr-prune@v0.5.0
+        uses: vlaurin/action-ghcr-prune@v0.6.0
         with:
           token: ${{ secrets.GHCR_TOKEN}}
           organization: ${{ github.repository_owner}}

.github/workflows/registry-purge.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 🧹 clean packages
-        uses: vlaurin/action-ghcr-prune@v0.5.0
+        uses: vlaurin/action-ghcr-prune@v0.6.0
         with:
           token: ${{ secrets.GHCR_TOKEN}}
           organization: ${{ github.repository_owner}}