cli.lwp3.repl: fix crash on macOS

This works around a bug in bleak.

Author: dlech

pybricksdev/cli/lwp3/repl.py

@@ -99,9 +99,15 @@ def callback(dev: BLEDevice, adv: AdvertisementData) -> None:
 
         queue.put_nowait(dev)
 
-    async with BleakScanner(detection_callback=callback):
+    async with BleakScanner(detection_callback=callback) as scanner:
         logger.info("scanning...")
         device = await queue.get()
+
+        # monkey patch for bleak bug
+        # https://github.com/hbldh/bleak/pull/534
+        if hasattr(scanner, "_manager"):
+            device.metadata["delegate"] = scanner._manager.central_manager.delegate()
+
         logger.info("found device")
 
     def handle_disconnect(client: BleakClient):