fix create_mocked_hub to work with relative hub

Author: tomer-w

.gitignore

@@ -193,3 +193,5 @@ cython_debug/
 .cursorignore
 .cursorindexingignore
 .vscode/tasks.json
+
+.github/mcp.json

custom_components/victron_mqtt/_vendor/victron_mqtt/testing/hub_helpers.py

@@ -72,7 +72,8 @@ async def _async_noop(_self: Any) -> None:
         keepalive_patch.start()
 
     try:
-        with patch("victron_mqtt.hub.mqtt.Client") as mock_client:
+        hub_module = Hub.__module__
+        with patch(f"{hub_module}.mqtt.Client") as mock_client:
             hub = Hub(
                 host="localhost",
                 port=1883,