Convert dispatch_uid to string in signal connections.

Using `str(id(self))` for `dispatch_uid` ensures compatibility with cases where signal identifiers are expected to be strings. This change prevents potential issues in environments that enforce strict type checks.

djangochannelsrestframework/observer/model_observer.py

@@ -61,11 +61,11 @@ def _connect(self):
 
         # this is used to capture the current state for the model
         post_init.connect(
-            self.post_init_receiver, sender=self.model_cls, dispatch_uid=id(self)
+            self.post_init_receiver, sender=self.model_cls, dispatch_uid=str(id(self))
         )
 
         post_save.connect(
-            self.post_save_receiver, sender=self.model_cls, dispatch_uid=id(self)
+            self.post_save_receiver, sender=self.model_cls, dispatch_uid=str(id(self))
         )
 
         for field in self.model_cls._meta.many_to_many:
@@ -76,7 +76,7 @@ def _connect(self):
             )
 
         post_delete.connect(
-            self.post_delete_receiver, sender=self.model_cls, dispatch_uid=id(self)
+            self.post_delete_receiver, sender=self.model_cls, dispatch_uid=str(id(self))
         )
 
     def post_init_receiver(self, instance: Model, **kwargs):