Update docker/metadata-action action to v6

.gitea/workflows/build.yaml

@@ -26,7 +26,7 @@ jobs:
 
       - name: Generate Docker metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             docker.valverde.cloud/${{ gitea.repository }}
@@ -39,7 +39,7 @@ jobs:
             latest=true
 
       - name: Build
-        uses: docker/build-push-action@v7
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile