all: bump Go-1.22, drop Go-1.20

[sbinet]

Please take a look.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (342a5ce) 73.40% compared to head (c5f3340) 72.61%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #774      +/-   ##
==========================================
- Coverage   73.40%   72.61%   -0.80%     
==========================================
  Files          56       61       +5     
  Lines        5178     7678    +2500     
==========================================
+ Hits         3801     5575    +1774     
- Misses       1193     1907     +714     
- Partials      184      196      +12     

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[sbinet]

PTAL (@kortschak could you also remove the 1.20.x required tests ? thanks)