use go1.16's module aware install vs tools.go

[dprotaso]

go install module@version will install pinned versions of executables. Use this approach vs vendoring as it doesn't pollute our go.mod file and vendor directory

[codecov-commenter]

Codecov Report

Merging #1028 (b1ffede) into main (0233fcd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1028   +/-   ##
=======================================
  Coverage   75.03%   75.03%           
=======================================
  Files         107      107           
  Lines        5072     5072           
=======================================
  Hits         3806     3806           
  Misses        720      720           
  Partials      546      546           

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[imjasonh]

Nice.

[jonjohnsonjr]

Bless you.