Fix CI failure on Circle CI

Summary:
X-link: fairinternal/detectron2#570

Pull Request resolved: #4251

Try to fix the CI failure https://app.circleci.com/pipelines/github/facebookresearch/detectron2?filter=all

Omegaconf released 2 days ago which may cause the issue https://pypi.org/project/omegaconf/#history

Reviewed By: sstsai-adl

Differential Revision: D36518426

fbshipit-source-id: b1cc2aba5faa3fef40f2a6f07aa5028dd69608df

Author: zhanghang1989

setup.py

@@ -181,7 +181,7 @@ def get_model_zoo_configs() -> List[str]:
         "future",  # used by caffe2
         "pydot",  # used to save caffe2 SVGs
         "dataclasses; python_version<'3.7'",
-        "omegaconf>=2.1",
+        "omegaconf>=2.1,<=2.2.0",
         "hydra-core>=1.1",
         "black==21.4b2",
         "scipy>1.5.1",