chore: drop support for go 1.16

[ubogdan]

Describe the PR
drop support for go 1.16 due to golang.org/x/net and golang.org/x/tools security issues

Relation issue
#1515

Additional context
None

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c9bca77) 83.87% compared to head (52164db) 83.87%.

❗ Current head 52164db differs from pull request most recent head ed6b3d1. Consider uploading reports for the commit ed6b3d1 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1518   +/-   ##
=======================================
  Coverage   83.87%   83.87%           
=======================================
  Files          19       19           
  Lines        3726     3726           
=======================================
  Hits         3125     3125           
  Misses        517      517           
  Partials       84       84           

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