Update vlaurin/action-ghcr-prune action to v0.6.0 (#233)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/prune-docker-images.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Prune plexanisync
-      uses: vlaurin/action-ghcr-prune@v0.5.0
+      uses: vlaurin/action-ghcr-prune@v0.6.0
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
         user: ${{ github.repository_owner }}
@@ -21,7 +21,7 @@ jobs:
           ^latest$
           ^v\d+
     - name: Prune tautulli
-      uses: vlaurin/action-ghcr-prune@v0.5.0
+      uses: vlaurin/action-ghcr-prune@v0.6.0
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
         user: ${{ github.repository_owner }}