chore: remove go 1.13 from gomod

[CyrusVorwald]

Checklist:

• I have performed a self-review of my own code
• I have documented my code in accordance with the documentation guidelines
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have run the unit tests
• I only have one commit (if not, squash them into one commit).
• I have a descriptive commit message that adheres to the commit message guidelines

Please review the CONTRIBUTING.md file for detailed contributing guidelines.

[codecov]

Codecov Report

Merging #816 (a3bd5f4) into main (44b036f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #816   +/-   ##
=========================================
  Coverage     37.98%   37.98%           
  Complexity      801      801           
=========================================
  Files           115      115           
  Lines         11161    11161           
  Branches        941      941           
=========================================
  Hits           4240     4240           
  Misses         6599     6599           
  Partials        322      322