chore: Bump golang version to 1.19

[codecov[bot]]

Codecov Report

Merging #29 (1ff90b2) into main (9abbf24) will increase coverage by 0.64%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   48.81%   49.46%   +0.64%     
==========================================
  Files           4        4              
  Lines         465      465              
==========================================
+ Hits          227      230       +3     
+ Misses        207      205       -2     
+ Partials       31       30       -1     

Impacted Files	Coverage Δ
controllers/virtinkmachine_controller.go	40.36% <0.00%> (-1.10%)	:arrow_down:
controllers/virtinkcluster_controller.go	54.67% <0.00%> (+4.31%)	:arrow_up:

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