Merge pull request #5803 from learningequality/dependabot/github_actions/docker/metadata-action-6

chore(deps): bump docker/metadata-action from 5 to 6

Author: rtibbles

.github/workflows/containerbuild.yml

@@ -50,7 +50,7 @@ jobs:
 
     - name: Extract metadata (tags, labels) for Docker
       id: meta
-      uses: docker/metadata-action@v5
+      uses: docker/metadata-action@v6
       with:
         images: ghcr.io/learningequality/postgres
       env: