Move StatusCode import to top of file

Author: Kludex

src/mcp/server/lowlevel/server.py

@@ -45,6 +45,7 @@ async def main():
 from typing import Any, Generic, cast
 
 import anyio
+from opentelemetry.trace import StatusCode
 from starlette.applications import Starlette
 from starlette.middleware import Middleware
 from starlette.middleware.authentication import AuthenticationMiddleware
@@ -516,8 +517,6 @@ async def _handle_request(
                 response = types.ErrorData(code=types.METHOD_NOT_FOUND, message="Method not found")
 
             if isinstance(response, types.ErrorData) and span is not None:
-                from opentelemetry.trace import StatusCode
-
                 span.set_status(StatusCode.ERROR, response.message)
 
             try: