Clippy errros with "casting `usize` to `u8` may truncate the value"

[cmichi]

IIRC there was a compilation error about the usize to u8 cast a while ago, the release was yanked at the time, and it was fixed. Clippy still errors because of it though:

main.rs:

use parity_scale_codec::{
    Decode,
    Encode,
};

#[derive(Encode, Decode)]
pub enum Foo {
    Bar,
}

fn main() { }

Cargo.toml:

[package]
name = "foobar"
edition = "2024"

[dependencies]
parity-scale-codec = { version = "=3.7.4", features = ["derive"] }

[workspace]

The following errors appear for clippy:

$ cargo +1.85 clippy -- -Dclippy::cast_possible_truncation  
    Checking foobar v0.0.0 (/tmp/foobar)
error: casting `usize` to `u8` may truncate the value
 --> src/main.rs:8:5
  |
8 |     Bar,
  |     ^^^
  |
  = help: if this is intentional allow the lint with `#[allow(clippy::cast_possible_truncation)]` ...
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_truncation
  = note: requested on the command line with `-D clippy::cast-possible-truncation`
help: ... or use `try_from` and handle the error accordingly
  |
8 |     Bar::try_from(Encode),
  |     ~~~~~~~~~~~~~~~~~~~~~

error: casting `usize` to `u8` may truncate the value
 --> src/main.rs:8:5
  |
8 |     Bar,
  |     ^^^
  |
  = help: if this is intentional allow the lint with `#[allow(clippy::cast_possible_truncation)]` ...
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_truncation
help: ... or use `try_from` and handle the error accordingly
  |
8 |     Bar::try_from(Encode),
  |     ~~~~~~~~~~~~~~~~~~~~~

error: casting `usize` to `u8` may truncate the value
 --> src/main.rs:8:5
  |
8 |     Bar,
  |     ^^^
  |
  = help: if this is intentional allow the lint with `#[allow(clippy::cast_possible_truncation)]` ...
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_truncation
help: ... or use `try_from` and handle the error accordingly
  |
8 |     Bar::try_from(Decode),
  |     ~~~~~~~~~~~~~~~~~~~~~