chore: golang 1.19 reached EOL, switch to 1.20

[vgarvardt]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b149ccb) 89.54% compared to head (8d68d95) 89.54%.

Files	Patch %	Lines
worker.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #248   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files          12       12           
  Lines         727      727           
=======================================
  Hits          651      651           
  Misses         56       56           
  Partials       20       20           

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