Require Go 1.21, remove ubinary & josharian/native

[hugelgupf]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@a3c409a). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage        ?   25.44%           
=======================================
  Files           ?       19           
  Lines           ?      566           
  Branches        ?        0           
=======================================
  Hits            ?      144           
  Misses          ?      410           
  Partials        ?       12           

Flag	Coverage Δ
1.21.x	29.38% <0.00%> (?)
1.22.x	25.44% <0.00%> (?)

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