Rollup merge of #155131 - sorairolake:stabilize-uint-bit-width, r=jhpratt

Stabilize feature `uint_bit_width`

Tracking issue: rust-lang/rust#142326
FCP is finished in https://github.com/rust-lang/rust/issues/142326#issuecomment-4224883142

Closes rust-lang/rust#142326

@rustbot modify labels: +T-libs-api