feat: explicit type annotation

Author: feng-95

packages/opentelemetry-instrumentation-mcp/opentelemetry/instrumentation/mcp/instrumentation.py

@@ -125,7 +125,9 @@ def _transport_wrapper(self, tracer):
         async def traced_method(
             wrapped: Callable[..., Any], instance: Any, args: Any, kwargs: Any
         ) -> AsyncGenerator[
-            Tuple["InstrumentedStreamReader", "InstrumentedStreamWriter"], None
+            Tuple["InstrumentedStreamReader", "InstrumentedStreamWriter"],
+            Tuple["InstrumentedStreamReader", "InstrumentedStreamWriter", Any],
+            None
         ]:
             async with wrapped(*args, **kwargs) as result:
                 try: