add grpcio restriction <=1.33.2

python/setup.py.server.in

@@ -28,7 +28,7 @@ max_version, mid_version, min_version = util.python_version()
 util.gen_pipeline_code("paddle_serving_server")
 
 REQUIRED_PACKAGES = [
-    'six >= 1.10.0', 'protobuf >= 3.11.0', 'grpcio >= 1.28.1', 'grpcio-tools >= 1.28.1',
+    'six >= 1.10.0', 'protobuf >= 3.11.0', 'grpcio <= 1.33.2', 'grpcio-tools <= 1.33.2',
     'paddle_serving_client', 'flask >= 1.1.1', 'paddle_serving_app', 'func_timeout', 'pyyaml'
 ]
 

python/setup.py.server_gpu.in

@@ -30,7 +30,7 @@ max_version, mid_version, min_version = util.python_version()
 util.gen_pipeline_code("paddle_serving_server_gpu")
 
 REQUIRED_PACKAGES = [
-    'six >= 1.10.0', 'protobuf >= 3.11.0', 'grpcio >= 1.28.1', 'grpcio-tools >= 1.28.1',
+    'six >= 1.10.0', 'protobuf >= 3.11.0', 'grpcio <= 1.33.2', 'grpcio-tools <= 1.33.2',
     'paddle_serving_client', 'flask >= 1.1.1', 'paddle_serving_app', 'func_timeout', 'pyyaml'
 ]