upgrade to go1.19

[cpanato]

Summary

• upgrade to go1.19

[codecov-commenter]

Codecov Report

Merging #1018 (1ece1f9) into main (2081fbb) will decrease coverage by 0.08%.
The diff coverage is 22.85%.

@@            Coverage Diff             @@
##             main    #1018      +/-   ##
==========================================
- Coverage   41.59%   41.51%   -0.09%     
==========================================
  Files          71       71              
  Lines        6933     6933              
==========================================
- Hits         2884     2878       -6     
- Misses       3748     3752       +4     
- Partials      301      303       +2     

Impacted Files	Coverage Δ
cmd/rekor-cli/app/search.go	20.00% <0.00%> (ø)
pkg/pki/pgp/pgp.go	78.04% <ø> (ø)
pkg/pki/ssh/ssh.go	0.00% <0.00%> (ø)
pkg/types/alpine/v0.0.1/entry.go	52.43% <0.00%> (-2.44%)	⬇️
pkg/types/cose/v0.0.1/entry.go	53.98% <0.00%> (ø)
pkg/types/hashedrekord/v0.0.1/entry.go	52.83% <0.00%> (ø)
pkg/types/helm/provenance.go	41.30% <ø> (ø)
pkg/types/helm/v0.0.1/entry.go	47.47% <0.00%> (ø)
pkg/types/intoto/v0.0.1/entry.go	55.20% <0.00%> (ø)
pkg/types/intoto/v0.0.2/entry.go	53.35% <0.00%> (ø)
... and 13 more

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