Bump rails from 5.2.1.1 to 5.2.2 (#9430)

Bumps [rails](https://github.com/rails/rails) from 5.2.1.1 to 5.2.2.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v5.2.1.1...v5.2.2

)

Signed-off-by: dependabot[bot] <support@dependabot.com>