fix(deps): update module golang.org/x/oauth2 to v0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
golang.org/x/oauth2	v0.0.0-20210402161424-2e8d93401602 -> v0.21.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 18.93%. Comparing base (880fba9) to head (dd5e7db).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   26.31%   18.93%   -7.38%     
==========================================
  Files           3        4       +1     
  Lines          95      132      +37     
==========================================
  Hits           25       25              
- Misses         67      104      +37     
  Partials        3        3              

Flag	Coverage Δ
unittests	18.93% <ø> (-7.38%)	⬇️

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