Summary: I am interested in running clippy under buck2 in CI for https://github.com/dtolnay/cxx, but I need it to be configured with `msrv = "..."` the same as my Cargo builds.
Reviewed By: diliop
Differential Revision: D43991741
fbshipit-source-id: c9a6a923651cebf5f24a48c6cd5daac0631cb763