GitHub Actions: drop netbsd 9.2

[masatake]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.87%. Comparing base (7023fdb) to head (853b53f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4385   +/-   ##
=======================================
  Coverage   85.87%   85.87%           
=======================================
  Files         252      252           
  Lines       62774    62774           
=======================================
  Hits        53906    53906           
  Misses       8868     8868           

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