chore: remove dep on gocover-cobertura

[ryancurrah]

Resolves #50

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.47%. Comparing base (5b94f7d) to head (0380d6c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   76.47%   76.47%           
=======================================
  Files           4        4           
  Lines         187      187           
=======================================
  Hits          143      143           
  Misses         44       44           

Flag	Coverage Δ
unittests	76.47% <ø> (ø)

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