Rollup merge of #141312 - cberner:filelock_from, r=joshtriplett

Add From<TryLockError> for io::Error

Adds a `From` impl to make error propagation easier, as discussed in the tracking issue

`TryLockError` is unstable under the "file_lock" feature. The related tracking issue is rust-lang/rust#130994

This PR also cleanups the Windows implementation of `try_lock()` and `try_lock_shared()` as [discussed here](rust-lang/rust#140718 (comment))

Author: matthiaskrgr