chore(deps): update docker/build-push-action action to v7

Author: renovate[bot]

.github/workflows/release.yml

@@ -48,7 +48,7 @@ jobs:
             org.opencontainers.image.vendor=Ophios GmbH
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           file: docker/Dockerfile