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

.gitea/workflows/release.yml

@@ -47,7 +47,7 @@ jobs:
           ref: ${{ needs.tag.outputs.tag_name }}
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v4
+        uses: docker/setup-buildx-action@v3
 
       - name: Log in to Gitea Container Registry
         uses: docker/login-action@v4
@@ -81,7 +81,7 @@ jobs:
           printf "Tags:\n${{ steps.meta.outputs.tags }}"
 
       - name: Build images
-        uses: docker/build-push-action@v7
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: false