Update dependency @types/supertest to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@types/supertest (source)	^2.0.11 -> ^6.0.2

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f2a9f49) 49.23% compared to head (aaae637) 49.23%.

❗ Current head aaae637 differs from pull request most recent head bf7776e. Consider uploading reports for the commit bf7776e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #960   +/-   ##
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  Coverage   49.23%   49.23%           
=======================================
  Files          68       68           
  Lines        1501     1501           
  Branches      159      159           
=======================================
  Hits          739      739           
  Misses        752      752           
  Partials       10       10           

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