update cloudpickle version to >=2.2.1

Author: liujiaorr

requirements/extras/test_requirements.txt

@@ -24,7 +24,7 @@ Jinja2==3.1.4
 pyvis==0.2.1
 pandas>=1.3.5,<1.5
 scikit-learn==1.3.0
-cloudpickle==2.2.1
+cloudpickle>=2.2.1
 PyYAML==6.0
 # TODO find workaround
 xgboost>=1.6.2,<=1.7.6