Use mock patch annotation for watchdog period

Author: TheJulianJES

tests/application/test_connect.py

@@ -1,4 +1,3 @@
-import asyncio
 from unittest.mock import AsyncMock, patch
 
 import pytest
@@ -201,14 +200,12 @@ async def test_disconnect_failure(device, make_application):
 
 
 @pytest.mark.parametrize("device", [FormedLaunchpadCC26X2R1])
+@patch("zigpy_znp.zigbee.application.ControllerApplication._watchdog_period", new=0.1)
 async def test_watchdog(device, make_application):
     app, znp_server = make_application(server_cls=device)
     app._watchdog_feed = AsyncMock(wraps=app._watchdog_feed)
 
-    with patch("zigpy.application.ControllerApplication._watchdog_period", new=0.1):
-        await app.startup(auto_form=False)
-        await asyncio.sleep(0.6)
-
+    await app.startup(auto_form=False)
     assert len(app._watchdog_feed.mock_calls) >= 5
 
     await app.shutdown()