ci: run tests on Go 1.27

[trim21]

Add ~1.27 to the test matrix in .github/workflows/test.yaml, alongside ~1.25 and ~1.26.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.68%. Comparing base (01395ae) to head (2d2d686).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   57.14%   66.68%   +9.53%     
==========================================
  Files          48       48              
  Lines        2287     2287              
==========================================
+ Hits         1307     1525     +218     
  Misses        760      760              
+ Partials      220        2     -218     

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[mergify]

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