Rollup merge of #122126 - workingjubilee:every-os-in-the-world-belongs-to-unix, r=ChrisDenton

Fix `tidy --bless` on  ̶X̶e̶n̶i̶x̶ Windows

As reported in rust-lang/rust#120628 (comment) the requested `tidy --bless` implementation didn't take into account the fact that earlier the linting code canonicalized things to use the OS path separator. This makes it so that the path separator is always rewritten back as '/', which should fix the variance there.

r? ``@ChrisDenton``

Author: GuillaumeGomez