Small Windows cleanups

[pitdicker]

We use Duration in a test on Windows. This is fine because Duration is an alias of TimeDelta, but I had to switch it to TimeDelta to make the merge with 0.5.x. Better be consistent and use TimeDelta everywhere.

This also fixes one Clippy warning in the Windows module, and sets up our CI to lint the Windows target. Apparently our CI wasn't doing that, despite --all-targets.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (21343be) 91.86% compared to head (92c227e) 91.86%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1441   +/-   ##
=======================================
  Coverage   91.86%   91.86%           
=======================================
  Files          40       40           
  Lines       17471    17471           
=======================================
  Hits        16049    16049           
  Misses       1422     1422           

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