fix(clippy): suppress unused lint on windows

[RoloEdits]

warning: unused variable: `md`
   --> helix-term\src\handlers\completion\path.rs:152:23
    |
152 | fn path_documentation(md: &fs::Metadata, full_path: &Path, kind: &str) -> String {
    |                       ^^ help: if this is intentional, prefix it with an underscore: `_md`
    |
    = note: `#[warn(unused_variables)]` on by default

[RoloEdits]

Not sure why this isn't passing. The variable was unused and all I did was suppress it. Also not able to replicate this test failure locally.

[the-mikedavis]

I'm pretty sure it's a flake. I restarted the workflow