chore(deps): update golang docker tag to v1.16

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
golang	stage	minor	1.14-stretch -> 1.16-stretch

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[codecov-commenter]

Codecov Report

Merging #163 (8ac824b) into main (ff51bc6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #163   +/-   ##
=======================================
  Coverage   42.21%   42.21%           
=======================================
  Files          14       14           
  Lines        2061     2061           
  Branches       42       42           
=======================================
  Hits          870      870           
  Misses       1173     1173           
  Partials       18       18           

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