chore(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	v0.7.0 -> v0.21.0

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.62%. Comparing base (f214c8f) to head (0c6f05e).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #108   +/-   ##
=======================================
  Coverage   35.62%   35.62%           
=======================================
  Files          12       12           
  Lines         685      685           
=======================================
  Hits          244      244           
  Misses        415      415           
  Partials       26       26           

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