Remove Go 1.21 and 1.22 from CI build matrix

[philippgille]

We're reducing the size of the build matrix in CI, to speed up the GitHub Actions. We're now testing the latest 2 Go versions, same as what the Go team officially supports: https://go.dev/doc/devel/release#policy

We try to keep gokv compatible with older versions as well, we're just not testing it in CI anymore. If you run into issues with an older version please let us know, we can look into it and maybe adapt accordingly.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.52%. Comparing base (1d71df2) to head (e128b2f).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #210   +/-   ##
=======================================
  Coverage   63.52%   63.52%           
=======================================
  Files          26       26           
  Lines        2174     2174           
=======================================
  Hits         1381     1381           
  Misses        673      673           
  Partials      120      120           

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