ruff

adf095e8 - [ty] Extend Liskov checks to also cover classmethods and staticmethods (#21598)

[ty] Extend Liskov checks to also cover classmethods and staticmethods (#21598) ## Summary Building on https://github.com/astral-sh/ruff/pull/21436. There's nothing conceptually more complicated about this, it just requires its own set of tests and its own subdiagnostic hint. I also uncovered another inconsistency between mypy/pyright/pyrefly, which is fun. In this case, I suggest we go with pyright's behaviour. ## Test Plan mdtests/snapshots