[Fix] Fix uvloop get_event_loop() is not suitable for 0.22.x (#13612)

Signed-off-by: lzy <tomlzy213@gmail.com>
Co-authored-by: lzy <tomlzy213@gmail.com>

python/sglang/srt/grpc/grpc_request_manager.py

@@ -28,7 +28,7 @@ from sglang.srt.managers.io_struct import (
     TokenizedGenerateReqInput,
 )
 from sglang.srt.server_args import PortArgs, ServerArgs
-from sglang.srt.utils import get_zmq_socket, kill_process_tree
+from sglang.srt.utils import get_or_create_event_loop, get_zmq_socket, kill_process_tree
 from sglang.utils import get_exception_traceback
 
 logger = logging.getLogger(__name__)
@@ -876,7 +876,7 @@ class GrpcRequestManager:
             return
 
         self.no_create_loop = True
-        loop = asyncio.get_event_loop()
+        loop = get_or_create_event_loop()
         self.asyncio_tasks.add(
             loop.create_task(print_exception_wrapper(self.handle_loop))
         )