Use Go 1.19 / Remove deprecated API usage

[sywhang]

Go 1.19 is out. Let's use it in the CI.

Also, this updates staticcheck version and removes deprecated API usage.

[codecov]

Codecov Report

Merging #352 (7d483c9) into master (7398ffb) will not change coverage.
The diff coverage is n/a.

❗ Current head 7d483c9 differs from pull request most recent head 8c133af. Consider uploading reports for the commit 8c133af to get more accurate results

@@           Coverage Diff           @@
##           master     #352   +/-   ##
=======================================
  Coverage   98.34%   98.34%           
=======================================
  Files          21       21           
  Lines        1450     1450           
=======================================
  Hits         1426     1426           
  Misses         15       15           
  Partials        9        9           

Impacted Files	Coverage Δ
decorate.go	100.00% <ø> (ø)
error.go	100.00% <ø> (ø)
inout.go	100.00% <ø> (ø)
internal/digtest/container.go	100.00% <ø> (ø)
internal/graph/graph.go	100.00% <ø> (ø)
param.go	97.37% <ø> (ø)
provide.go	100.00% <ø> (ø)
visualize.go	89.74% <ø> (ø)

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[abhinav]

probably gotta run gofmt