Update docker/build-push-action action to v7

Author: renovate[bot]

.github/workflows/release-docker.yaml

@@ -50,7 +50,7 @@ jobs:
           echo "tag=${tag}" >> "$GITHUB_OUTPUT"
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true