fix: replace deprecated SOURCE_TYPE_GPS with SourceType.GPS (#365)

custom_components/weenect/device_tracker.py

@@ -1,7 +1,7 @@
 """Device tracker platform for weenect."""
 from typing import List
 
-from homeassistant.components.device_tracker import SOURCE_TYPE_GPS
+from homeassistant.components.device_tracker import SourceType
 from homeassistant.components.device_tracker.config_entry import TrackerEntity
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant, ServiceCall, callback
@@ -153,9 +153,9 @@ def longitude(self):
                 return self.coordinator.data[self.id]["position"][0]["longitude"]
 
     @property
-    def source_type(self):
+    def source_type(self) -> SourceType:
         """Return the source type, e.g. GPS or router, of the device."""
-        return SOURCE_TYPE_GPS
+        return SourceType.GPS
 
     @property
     def location_accuracy(self):