feat: use go 1.19

[CarlJi]

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[codecov]

Codecov Report

Merging #302 (d59b271) into master (fd3df3e) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #302      +/-   ##
==========================================
- Coverage   70.76%   70.66%   -0.10%     
==========================================
  Files          34       34              
  Lines        2035     2035              
==========================================
- Hits         1440     1438       -2     
- Misses        482      483       +1     
- Partials      113      114       +1     

Flag	Coverage Δ
e2e-1.16.x	?
e2e-1.17.x	?
e2e-1.18.x	?
unittest-1.16.x	70.66% <ø> (ø)
unittest-1.17.x	70.66% <ø> (-0.10%)	⬇️
unittest-1.18.x	70.66% <ø> (ø)
unittest-1.19.x	70.66% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/diff.go	28.57% <ø> (ø)
pkg/cover/cover.go	72.04% <ø> (ø)
pkg/cover/server.go	83.03% <ø> (ø)
pkg/prow/job.go	78.84% <ø> (ø)
pkg/build/legacy.go	95.12% <0.00%> (-4.88%)	⬇️