chore: Update Go version to 1.19

[bstasyszyn]

This also required an update to the latest golangci-lint v1.50.0. So this PR fixes the problems flagged by the latest linter.

closes #1485

Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com

[codecov]

Codecov Report

Base: 88.14% // Head: 88.07% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (578d266) compared to base (efd0bb9).
Patch coverage: 79.67% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1509      +/-   ##
==========================================
- Coverage   88.14%   88.07%   -0.07%     
==========================================
  Files         218      218              
  Lines       20782    20793      +11     
==========================================
- Hits        18318    18314       -4     
- Misses       1575     1587      +12     
- Partials      889      892       +3     

Impacted Files	Coverage Δ
cmd/orb-driver/startcmd/start.go	47.82% <0.00%> (-0.42%)	⬇️
internal/pkg/cmdutil/cmdutil.go	84.21% <ø> (ø)
internal/pkg/ldcontext/ldcontext.go	61.53% <ø> (ø)
internal/pkg/log/fields.go	98.73% <ø> (ø)
internal/pkg/log/logger.go	96.47% <ø> (ø)
pkg/activitypub/resthandler/openapi.go	0.00% <0.00%> (ø)
pkg/activitypub/resthandler/resthandler.go	89.47% <ø> (ø)
...ctivitypub/service/activityhandler/inboxhandler.go	83.38% <ø> (ø)
...vitypub/service/anchorsynctask/activitysynctask.go	88.23% <ø> (ø)
pkg/activitypub/service/service.go	94.36% <ø> (ø)
... and 85 more

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