Makefile: use macro to define the minimum required go version

[libotony]

Description

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• New and existing E2E tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.42%. Comparing base (3efaf7a) to head (80ccbf4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1047   +/-   ##
=======================================
  Coverage   60.42%   60.42%           
=======================================
  Files         219      219           
  Lines       22774    22774           
=======================================
  Hits        13762    13762           
  Misses       7917     7917           
  Partials     1095     1095           

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