Updated build

Author: frozenfoxx

.github/workflows/build.yml

@@ -45,7 +45,7 @@ jobs:
           cache-to: type=registry,ref=${{ secrets.DOCKER_HUB_USERNAME }}/zandronum-server:buildcache,mode=max
 
       - name: Build and push (Multiplay)
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile.multiplay