Bump rspec-rails from 3.9.1 to 4.0.0 (#13364)

Bump rspec-rails from 3.9.1 to 4.0.0 (#13364)

Bumps [rspec-rails](https://github.com/rspec/rspec-rails) from 3.9.1 to 4.0.0.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/master/Changelog.md)
- [Commits](https://github.com/rspec/rspec-rails/compare/v3.9.1...v4.0.0)

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