Suppress redundant_field_names clippy lint

[dtolnay]

New clippy lint in nightly-2026-08-08.

warning: redundant field names in struct initialization
  --> tests/test_from.rs:9:5
   |
 9 | /     #[from]
10 | |     source: io::Error,
   | |__________^ help: replace it with: `source`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
   = note: `-W clippy::redundant-field-names` implied by `-W clippy::all`
   = help: to override `-W clippy::all` add `#[allow(clippy::redundant_field_names)]`

warning: redundant field names in struct initialization
  --> tests/test_from.rs:32:9
   |
32 | /         #[from]
33 | |         source: io::Error,
   | |______________^ help: replace it with: `source`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names

warning: redundant field names in struct initialization
   --> tests/test_generics.rs:145:5
    |
145 | /     #[from]
146 | |     pub source: StructDebugGeneric<E>,
    | |______________^ help: replace it with: `source`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
    = note: `-W clippy::redundant-field-names` implied by `-W clippy::all`
    = help: to override `-W clippy::all` add `#[allow(clippy::redundant_field_names)]`