Fix windows version retrieval

[znicholls]

Description

Checklist

Please confirm that this pull request has done the following:

• (N/A) Tests added
• (N/A) Documentation added (where applicable)
• Changelog item added to changelog/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.93%. Comparing base (e16bc96) to head (264a0be).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   92.93%   92.93%           
=======================================
  Files          15       15           
  Lines         580      580           
  Branches       78       78           
=======================================
  Hits          539      539           
  Misses         40       40           
  Partials        1        1           

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[znicholls]

gtg https://github.com/openscm/OpenSCM-Calibration/actions/runs/10898869161/job/30243002830