Update dependency webtest to v3.0.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webtest	==3.0.0 -> ==3.0.1

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.51%. Comparing base (86fe195) to head (6cb029d).
Report is 27 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2048   +/-   ##
=======================================
  Coverage   85.51%   85.51%           
=======================================
  Files         120      120           
  Lines        5276     5276           
=======================================
  Hits         4512     4512           
  Misses        764      764           

Flag	Coverage Δ
unittests	85.51% <ø> (ø)

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