chore: drop support for go 1.14

[ubogdan]

Describe the PR
drop support for go 1.14

Relation issue
None.

Additional context
None

[ubogdan]

Just to be ready in case we will like to introduce this in next release.

[codecov]

Codecov Report

Merging #1111 (6f3dbdc) into master (32f02b9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1111   +/-   ##
=======================================
  Coverage   94.59%   94.59%           
=======================================
  Files           9        9           
  Lines        2370     2370           
=======================================
  Hits         2242     2242           
  Misses         67       67           
  Partials       61       61           

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