Bump Golang to 1.21.5

[vania-pooh]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b4fca96) 5.59% compared to head (479d687) 5.59%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #659   +/-   ##
======================================
  Coverage    5.59%   5.59%           
======================================
  Files           8       8           
  Lines         876     876           
======================================
  Hits           49      49           
  Misses        820     820           
  Partials        7       7           

Flag	Coverage Δ
go	5.59% <ø> (ø)

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