Update @vue/test-utils to 1.0.0-beta.29

[service-paradis]

Proposed Changes

• Fixed a bug (Removing sync mode vuejs/vue-test-utils#1137)
• Remove unnecessary warning when running unit tests

[codecov]

Codecov Report

Merging #2201 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2201   +/-   ##
=======================================
  Coverage   64.94%   64.94%           
=======================================
  Files          70       70           
  Lines        2630     2630           
  Branches      881      881           
=======================================
  Hits         1708     1708           
  Misses        849      849           
  Partials       73       73

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