Update to Golang 1.19

[tekenstam]

Also some minor build fixes.

[codecov[bot]]

Codecov Report

Merging #373 (3bb8fab) into master (5d940a3) will decrease coverage by 4.61%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #373      +/-   ##
==========================================
- Coverage   45.17%   40.57%   -4.61%     
==========================================
  Files           7        7              
  Lines         757      594     -163     
==========================================
- Hits          342      241     -101     
+ Misses        376      336      -40     
+ Partials       39       17      -22     

Flag	Coverage Δ
unittests	40.57% <ø> (-4.61%)	:arrow_down:

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see 3 files with indirect coverage changes

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