Bumps [doorkeeper](https://github.com/doorkeeper-gem/doorkeeper) from 5.4.0 to 5.5.0.
- [Release notes](https://github.com/doorkeeper-gem/doorkeeper/releases)
- [Changelog](https://github.com/doorkeeper-gem/doorkeeper/blob/main/CHANGELOG.md)
- [Commits](https://github.com/doorkeeper-gem/doorkeeper/compare/v5.4.0...v5.5.0

)

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