Update submodule URL based on redirection. (#20973)
Summary:
Changes:
- protobuf has been moved to protocolbuffers/protobuf a while ago.
- cpuinfo has been moved to pytorch/cpuinfo and updated in FBGEMM recently.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20973
Differential Revision: D15511926
Pulled By: soumith
fbshipit-source-id: 2c50373c9b245524f839bd1059870dd2b84e3b81
