fix how async client is determined when getting raw access to the valkey client

Author: amirreza8002

CHANGES.md

@@ -8,6 +8,7 @@ Version 0.3.0
 
 ### bug fix
 - fixed bug of `omit_exception` not handling generator and async generators
+- fixed bug of async `get_valkey_connection` checking if the client is async.
 
 ### internal change
 - moved all operations from `django_valkey.cache` and `django_valkey.async_cache.cache` to `django_valkey.base`.

django_valkey/async_cache/__init__.py

@@ -1,4 +1,4 @@
-from inspect import isawaitable
+from inspect import iscoroutinefunction
 
 
 async def get_valkey_connection(alias="default", write=True):
@@ -17,7 +17,7 @@ async def get_valkey_connection(alias="default", write=True):
     if not hasattr(cache.client, "get_client"):
         raise NotImplementedError(error_message)
 
-    if not isawaitable(cache.client.get_client):
+    if not iscoroutinefunction(cache.client.get_client):
         raise "use django_valkey.get_valkey_connection for sync backends"
 
     return await cache.client.get_client(write)