refactor(rust): Allow polars to pass cargo check on windows

[squnit]

This fix is similar to what was done in #18498. We also added windows to lint-rust.yml in CI to prevent similar issues from occuring again.

It fixes cargo check regression in windows as of 5c4e7e9 with the message

$ cargo check --workspace --all-targets --all-features
...
   --> crates\polars-utils\src\mmap.rs:130:20
    |
130 | use polars_error::{polars_bail, PolarsResult};
    |                    ^^^^^^^^^^^
    |
    = note: `#[warn(unused_imports)]` on by default
...

This is caused by #18532 at

polars/crates/polars-utils/src/mmap.rs

Line 127 in ac2456c

use polars_error::{polars_bail, PolarsResult};

polars/crates/polars-utils/src/mmap.rs

Lines 311 to 319 in ac2456c

	#[cfg(target_family = "unix")]
	{
	use std::os::unix::fs::MetadataExt;
	let guard = MEMORY_MAPPED_FILES.lock().unwrap();
	let metadata = file.metadata()?;
	if guard.contains_key(&(metadata.dev(), metadata.ino())) {
	polars_bail!(ComputeError: "cannot write to file: already memory mapped");
	}
	}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.91%. Comparing base (5c4e7e9) to head (c1456e4).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18672   +/-   ##
=======================================
  Coverage   79.90%   79.91%           
=======================================
  Files        1512     1512           
  Lines      203203   203203           
  Branches     2891     2891           
=======================================
+ Hits       162379   162390   +11     
+ Misses      40274    40263   -11     
  Partials      550      550           

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[ritchie46]

Thanks for the fix, but I don't want extra linting on windows runners. It will make CI much more costly and I don't think it's worth it for this one.

[squnit]

@ritchie46 I've reverted the change in CI configs.

[ritchie46]

Than ks!