chore(deps): update docker/metadata-action action to v6

Author: mend-for-github-com[bot]

.github/workflows/build-image.yml

@@ -88,7 +88,7 @@ jobs:
 
       - name: Generate Docker metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: test-app
           tags: |