Bumps [doorkeeper](https://github.com/doorkeeper-gem/doorkeeper) from 5.2.1 to 5.2.2.
- [Release notes](https://github.com/doorkeeper-gem/doorkeeper/releases)
- [Changelog](https://github.com/doorkeeper-gem/doorkeeper/blob/master/CHANGELOG.md)
- [Commits](https://github.com/doorkeeper-gem/doorkeeper/compare/v5.2.1...v5.2.2

)

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