Rollup of 11 pull requests

Successful merges:

 - rust-lang#133312 (triagebot: automatically add more rustdoc related labels)
 - rust-lang#134016 (Stabilize `const_is_char_boundary` and `const_str_split_at`.)
 - rust-lang#135813 (CI: split i686-mingw job to three free runners)
 - rust-lang#136879 (Add safe new() to NotAllOnes)
 - rust-lang#136971 (Add a new check-pass UI test for returning `impl Fn(T) -> impl Trait`)
 - rust-lang#136983 (Prepare standard library for Rust 2024 migration)
 - rust-lang#137002 (Fix early lint check desc in query)
 - rust-lang#137006 (borrowck diagnostics cleanup: remove an unused and a barely-used field)
 - rust-lang#137026 (Stabilize (and const-stabilize) `integer_sign_cast`)
 - rust-lang#137028 (mir_build: Clarify some code for lowering `hir::PatExpr` to THIR)
 - rust-lang#137032 (Decode metadata buffer in one go)

r? `@ghost`
`@rustbot` modify labels: rollup

…kingjubilee

Rollup of 10 pull requests

Successful merges:

 - rust-lang#133312 (triagebot: automatically add more rustdoc related labels)
 - rust-lang#134016 (Stabilize `const_is_char_boundary` and `const_str_split_at`.)
 - rust-lang#136971 (Add a new check-pass UI test for returning `impl Fn(T) -> impl Trait`)
 - rust-lang#136983 (Prepare standard library for Rust 2024 migration)
 - rust-lang#137002 (Fix early lint check desc in query)
 - rust-lang#137006 (borrowck diagnostics cleanup: remove an unused and a barely-used field)
 - rust-lang#137032 (Decode metadata buffer in one go)
 - rust-lang#137035 (Normalize closure instance before eagerly monomorphizing it)
 - rust-lang#137037 (add x86-sse2 (32bit) ABI that requires SSE2 target feature)
 - rust-lang#137038 (llvm: Tolerate captures in tests)

r? `@ghost`
`@rustbot` modify labels: rollup