[LiteInterpreter] Specify `Loader` to `yaml.load` (#67694)
Summary:
It became a mandatory argument since PyYaml-6, but has been present since PyYaml-3
Unblock migration to newer runtime
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67694
Reviewed By: seemethere
Differential Revision: D32106043
Pulled By: malfet
fbshipit-source-id: 35246b97a974b168c066396ea31987b267534c7f
