Switch our Linux machine AMI to a newer image. (#18433)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18433
ghimport-source-id: 1c92f98b091232c0045a2e1db75d19c1f258ac1f
Differential Revision: D14748827
Pulled By: ezyang
fbshipit-source-id: a459451058cf5560811403bafb96c6ff083d7e3a
