Update dependency com.google.android.gms:play-services-auth to v21.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.google.android.gms:play-services-auth	21.5.1 → 21.6.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.23%. Comparing base (2c3016d) to head (f724dce).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4438   +/-   ##
========================================
  Coverage    52.23%   52.23%           
========================================
  Files          457      457           
  Lines        12170    12170           
  Branches      2109     2109           
========================================
  Hits          6357     6357           
  Misses        5192     5192           
  Partials       621      621           

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