fix: resolve mypy type errors in test_llm_client.py

django/aiservice/tests/aiservice/test_llm_client.py

@@ -35,7 +35,7 @@ class TestLLMClientEventLoopHandling:
         ):
             # Create mock instances with close methods
             # Need to create new instances on each call to simulate proper client creation
-            def create_openai_mock(*args, **kwargs):
+            def create_openai_mock(*args: object, **kwargs: object) -> MagicMock:
                 mock = MagicMock()
                 mock.close = AsyncMock()
                 mock.chat = MagicMock()
@@ -48,7 +48,7 @@ class TestLLMClientEventLoopHandling:
                 )
                 return mock
 
-            def create_anthropic_mock(*args, **kwargs):
+            def create_anthropic_mock(*args: object, **kwargs: object) -> MagicMock:
                 mock = MagicMock()
                 mock.close = AsyncMock()
                 return mock
@@ -74,8 +74,8 @@ class TestLLMClientEventLoopHandling:
 
             # Simulate event loop change by creating a new loop and running in it
             # In Django/ASGI, this happens when requests are handled by different workers
-            def make_call_in_new_loop():
-                async def inner():
+            def make_call_in_new_loop() -> None:
+                async def inner() -> None:
                     # Create a fresh LLM object in the new loop
                     new_llm = LLM(
                         name="gpt-4.1", model_type="openai", input_cost=2.0, output_cost=8.0, cached_input_cost=None