Update json dependency to release/3.12.0 (#5473)

Summary:
X-link: https://github.com/facebookresearch/FBGEMM/pull/2446

To be in sync with pytorch/pytorch#154817

Pull Request resolved: #5473

Reviewed By: huydhn

Differential Revision: D96155876

Pulled By: malfet

fbshipit-source-id: 80d376866b419e6c7000d29ae846251ac775f24f

Author: malfet