Ruff 0.12

Summary
--

Release branch for Ruff 0.12.0

TODOs
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- [ ] Drop empty first commit
- [ ] Merge with rebase-merge (**don't squash merge!!!!**)

crates/ruff_linter/src/rules/ruff/rules/unused_async.rs

@@ -7,6 +7,7 @@ use ruff_python_semantic::analyze::function_type::is_stub;
 
 use crate::Violation;
 use crate::checkers::ast::Checker;
+
 use crate::rules::fastapi::rules::is_fastapi_route;
 
 /// ## What it does