raylib networking: prevent concurrently updating networks (#36066)

* dont run by multiple threads at the same time!

* this doesn't work since we rely on is_connected

* Revert "this doesn't work since we rely on is_connected"

This reverts commit 7455b2fe83.

system/ui/lib/wifi_manager.py

@@ -370,6 +370,7 @@ class WifiManager:
       cloudlog.warning(f"Failed to request scan: {reply}")
 
   def _update_networks(self):
+    with self._lock:
       if self._wifi_device is None:
         cloudlog.warning("No WiFi device found")
         return