fix(deps): update dependency org.gwtproject:gwt-user to v2.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.gwtproject:gwt-user (source)	2.11.0 -> 2.12.1

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.18%. Comparing base (ea77e5a) to head (7c5e19b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1152   +/-   ##
=========================================
  Coverage     52.18%   52.18%           
  Complexity     1459     1459           
=========================================
  Files           251      251           
  Lines         10248    10248           
  Branches       1104     1104           
=========================================
  Hits           5348     5348           
  Misses         4580     4580           
  Partials        320      320           

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