Update maildev/maildev Docker tag to v2.2.1

[renovate]

This PR contains the following updates:

Package	Update	Change
maildev/maildev	minor	2.1.0 -> 2.2.1

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.37%. Comparing base (4b021b4) to head (2a0c64a).
Report is 21 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9410   +/-   ##
=======================================
  Coverage   65.37%   65.37%           
=======================================
  Files         624      624           
  Lines       59660    59660           
  Branches     6687     6687           
=======================================
  Hits        39005    39005           
  Misses      20655    20655           

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