Open json config file in context manager (#58077)
Summary:
* Open json config file safely using a context manager (using a with block).
* This will make sure that the file closed even if an exception is raised.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58077
Reviewed By: anjali411
Differential Revision: D28711177
Pulled By: H-Huang
fbshipit-source-id: 597ba578311b1f1d6706e487872db4e784c78c3c
