Update rspec-rails requirement from ~> 4.0 to ~> 5.0
Update rspec-rails requirement from ~> 4.0 to ~> 5.0

Updates the requirements on [rspec-rails](https://github.com/rspec/rspec-rails) to permit the latest version.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/main/Changelog.md)
- [Commits](https://github.com/rspec/rspec-rails/compare/v4.0.0...v5.0.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
doorkeeper-gem/doorkeeper,doorkeeper-gem/doorkeeper,doorkeeper-gem/doorkeeper