Bump rails-settings-cached from 0.6.6 to 2.1.1

Bumps [rails-settings-cached](https://github.com/huacnlee/rails-settings-cached) from 0.6.6 to 2.1.1.
- [Release notes](https://github.com/huacnlee/rails-settings-cached/releases)
- [Changelog](https://github.com/huacnlee/rails-settings-cached/blob/master/CHANGELOG.md)
- [Commits](https://github.com/huacnlee/rails-settings-cached/compare/v0.6.6...v2.1.1

)

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