MSRV 1.81.0 TODO

[SteveLauC]

Rust 1.81.0 adds a new lint level expect, IIUC, this is for false-positive lints, it allows a lint temporarily and gives a warning when the lint is no longer needed so that you can remove the lint. Nix should replace all the allow(false_positve_lint) with expect(false_positive_lint) when we bump our MSRV to 1.81.0.

Ref: https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html#expectlint