fix(deps): rm duplicate supertest dependency

[andypols]

This PR removes the duplicate supertest entry, which was listed in both dependencies and devDependencies.

[netlify]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.78%. Comparing base (6713757) to head (850ea55).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1419   +/-   ##
=======================================
  Coverage   81.78%   81.78%           
=======================================
  Files          67       67           
  Lines        4766     4766           
  Branches      827      827           
=======================================
  Hits         3898     3898           
  Misses        852      852           
  Partials       16       16           

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