Remove unnecessary string annotations for runtime imports

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: adamtheturtle

src/mock_vws/_requests_mock_server/decorators.py

@@ -140,8 +140,8 @@ def _wrap_callback(
         """Wrap a callback to add a response delay."""
 
         def wrapped(
-            request: "PreparedRequest",
-        ) -> "_ResponseType":
+            request: PreparedRequest,
+        ) -> _ResponseType:
             # req_kwargs is added dynamically by the responses
             # library onto PreparedRequest objects - it is not
             # in the requests type stubs.