Revert "update cloudpickle version to >=2.2.1 in pyproject.toml (#4899)" (#4902)

Author: liujiaorr

pyproject.toml

@@ -33,7 +33,7 @@ classifiers = [
 dependencies = [
   "attrs>=23.1.0,<24",
   "boto3>=1.34.142,<2.0",
-  "cloudpickle>=2.2.1",
+  "cloudpickle==2.2.1",
   "docker",
   "google-pasta",
   "importlib-metadata>=1.4.0,<7.0",