[Fix] switch mmaction2totorchserve from mmcv to mmengine (#2053)

* switch to mmengine

* fix precommit

tools/deployment/mmaction2torchserve.py

@@ -4,7 +4,8 @@
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
-import mmcv
+from mmengine.config import Config
+from mmengine.utils import mkdir_or_exist
 
 try:
     from model_archiver.model_packaging import package_model
@@ -38,9 +39,9 @@ def mmaction2torchserve(
         force (bool): If True, if there is an existing `{model_name}.mar` file
             under `output_folder` it will be overwritten.
     """
-    mmcv.mkdir_or_exist(output_folder)
+    mkdir_or_exist(output_folder)
 
-    config = mmcv.Config.fromfile(config_file)
+    config = Config.fromfile(config_file)
 
     with TemporaryDirectory() as tmpdir:
         config.dump(f'{tmpdir}/config.py')