Update tests a-b to use async_get() instead of async_get_registry() (#47651)

tests/components/blebox/test_climate.py

@@ -1,5 +1,4 @@
 """BleBox climate entities tests."""
-
 import logging
 from unittest.mock import AsyncMock, PropertyMock
 
@@ -28,6 +27,7 @@ from homeassistant.const import (
     ATTR_TEMPERATURE,
     STATE_UNKNOWN,
 )
+from homeassistant.helpers import device_registry as dr
 
 from .conftest import async_setup_entity, mock_feature
 
@@ -79,7 +79,7 @@ async def test_init(saunabox, hass, config):
 
     assert state.state == STATE_UNKNOWN
 
-    device_registry = await hass.helpers.device_registry.async_get_registry()
+    device_registry = dr.async_get(hass)
     device = device_registry.async_get(entry.device_id)
 
     assert device.name == "My sauna"