all: drop Go-1.19, add Go-1.21

[sbinet]

No description provided.

[codecov]

Codecov Report

Patch coverage: 71.42% and project coverage change: -0.06% ⚠️

Comparison is base (bd7e871) 67.63% compared to head (e16dc3e) 67.57%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
- Coverage   67.63%   67.57%   -0.06%     
==========================================
  Files          29       29              
  Lines        2555     2560       +5     
==========================================
+ Hits         1728     1730       +2     
- Misses        724      727       +3     
  Partials      103      103              

Files Changed	Coverage Δ
rep.go	69.43% <71.42%> (-0.26%)	⬇️

... and 2 files with indirect coverage changes

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