ruff

98ab6662 - [`refurb`] Allow subclassing builtins in stub files (`FURB189`) (#26812)

[`refurb`] Allow subclassing builtins in stub files (`FURB189`) (#26812) Summary -- While looking at rule stabilization candidates for 0.16, I noticed that #15291 has been blocking stabilization of this rule for quite a while despite being a one-line change. I decided to make that one-line change since it seemed sensible to me. I'll still plan to hold off on stabilization until this change has been in preview for a release cycle, but this should pave the way to stabilization in 0.17. Closed #15291 Test Plan -- New mdtest showing that the rule is inactive in stub files