chore(*) update Go build comments

[jpeach]

Summary

Running "make check" with Go 1.17 updates the build comments. These
comments are harmless to earlier Go releases.

Full changelog

N/A

Issues resolved

N/A

Documentation

N/A

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

Backwards compatibility

• Add backport-to-stable label if the code is backwards compatible. Otherwise, list breaking changes.

[bartsmykla]

lgtm

[codecov-commenter]

Codecov Report

Merging #2978 (6ef198d) into master (704c57c) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2978      +/-   ##
==========================================
+ Coverage   52.33%   52.37%   +0.04%     
==========================================
  Files         912      912              
  Lines       52583    52583              
==========================================
+ Hits        27517    27539      +22     
+ Misses      22876    22846      -30     
- Partials     2190     2198       +8     

Impacted Files	Coverage Δ
...p/kumactl/cmd/install/install_transparent_proxy.go	64.79% <ø> (ø)
...mactl/cmd/uninstall/uninstall_transparent_proxy.go	59.37% <ø> (ø)
...resources/apis/mesh/dataplane_validator_gateway.go	100.00% <ø> (ø)
pkg/plugins/runtime/gateway/enabled.go	100.00% <ø> (ø)
pkg/plugins/runtime/gateway/register/enabled.go	100.00% <ø> (ø)
pkg/util/os/limits.go	68.42% <ø> (ø)
pkg/plugins/leader/postgres/leader_elector.go	93.61% <0.00%> (-4.26%)	⬇️
pkg/core/resources/manager/cache.go	83.11% <0.00%> (-2.60%)	⬇️
pkg/insights/resyncer.go	68.08% <0.00%> (+2.83%)	⬆️
pkg/events/eventbus.go	92.59% <0.00%> (+7.40%)	⬆️
... and 3 more

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