Updating submodules
Updating submodules

Summary:
GitHub commits:

https://github.com/facebook/folly/commit/8f91f848036539909938182d46e35cfade581266
https://github.com/facebookincubator/katran/commit/617a252e90b2e358af520dab4b5c4d38e7e4e69d
https://github.com/pytorch/fbgemm/commit/377c316aa0037c98e297b707cb96afed4b85411a

Reviewed By: wittgenst

fbshipit-source-id: 911874b032e2a01190636c5008fd06c0080ee7f4

facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst