Update rack-oauth2 from 1.2.1 to 1.2.3.
Removes methods deprecated in Rails 5. Working toward #14286 (closed).
Changelog: https://github.com/nov/rack-oauth2/compare/v1.2.1...v1.2.3
Removes methods deprecated in Rails 5. Working toward #14286 (closed).
Changelog: https://github.com/nov/rack-oauth2/compare/v1.2.1...v1.2.3