Deprecation fix: use async_register_admin_service

This fixes the following reported issue:

Detected that custom integration 'localtuya' accesses
hass.helpers.service, which should be updated to import functions used
from service directly at custom_components/localtuya/__init__.py,
line 165: hass.helpers.service.async_register_admin_service(. This will
stop working in Home Assistant 2025.5, please create a bug report at
https://github.com/rospogrigio/localtuya/issues

custom_components/localtuya/__init__.py

@@ -26,6 +26,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers.device_registry import DeviceEntry
 from homeassistant.helpers.event import async_track_time_interval
+from homeassistant.helpers.service import async_register_admin_service
 
 from .cloud_api import TuyaCloudApi
 from .common import TuyaDevice, async_config_entry_by_device_id
@@ -162,7 +163,8 @@ async def async_setup(hass: HomeAssistant, config: dict):
 
     async_track_time_interval(hass, _async_reconnect, RECONNECT_INTERVAL)
 
-    hass.helpers.service.async_register_admin_service(
+    async_register_admin_service(
+        hass,
         DOMAIN,
         SERVICE_RELOAD,
         _handle_reload,