Skip one more test on a specific R version on Windows

[MichaelChirico]

Also found incidentally by #2501.

Also encapsulate the skip() logic by dropping cases, rather than formally skip()ing in a loop (the test code was getting pretty distracting).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.55%. Comparing base (901d9ed) to head (71f054e).

❗ Current head 71f054e differs from pull request most recent head 37167e8. Consider uploading reports for the commit 37167e8 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2504   +/-   ##
=======================================
  Coverage   98.55%   98.55%           
=======================================
  Files         126      126           
  Lines        5762     5762           
=======================================
  Hits         5679     5679           
  Misses         83       83           

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