Propose fix for `cast_sign_loss` and `cast_possible_wrap`

[Rua]

Description

The integer_sign_cast API is about to be stabilised:
rust-lang/rust#125882

This means that clippy can then propose these functions as a fix for the cast_sign_loss and cast_possible_wrap lints.

[nk9]

@rustbot label S-documentation C-enhancement "good first issue"

[rustbot]

Unknown labels: S-documentation

[nk9]

@rustbot label A-documentation C-enhancement "good first issue"

[nk9]

The necessary API was stabilized in 1.87.0

[BelimFaux]

Since the API is stabilized, this can probably be implemented. Is anybody currently working on this?