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

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
golang.org/x/oauth2	v0.20.0 -> v0.21.0

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 8.99%. Comparing base (4d84122) to head (97fa40a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #117 +/- ## ===================================== Coverage 8.99% 8.99% ===================================== Files 3 3 Lines 278 278 ===================================== Hits 25 25 Misses 253 253 ```

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