Fixed mypy errors in test_async_client.py and test_client.py

Author: hramezani

tests/client/test_async_client.py

@@ -95,7 +95,7 @@ async def test_raise_for_status(server):
                     response.raise_for_status()
                 assert exc_info.value.response == response
             else:
-                assert response.raise_for_status() is None
+                assert response.raise_for_status() is None  # type: ignore
 
 
 @pytest.mark.usefixtures("async_environment")

tests/client/test_client.py

@@ -110,7 +110,7 @@ def test_raise_for_status(server):
                     response.raise_for_status()
                 assert exc_info.value.response == response
             else:
-                assert response.raise_for_status() is None
+                assert response.raise_for_status() is None  # type: ignore
 
 
 def test_options(server):