Bump rubocop-rails from 2.2.1 to 2.3.0 (#1975)

Bumps [rubocop-rails](https://github.com/rubocop-hq/rubocop-rails) from 2.2.1 to 2.3.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.2.1...v2.3.0)

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

Gemfile.lock

@@ -276,7 +276,7 @@ GEM
       unicode-display_width (>= 1.4.0, < 1.7)
     rubocop-performance (1.4.1)
       rubocop (>= 0.71.0)
-    rubocop-rails (2.2.1)
+    rubocop-rails (2.3.0)
       rack (>= 1.1)
       rubocop (>= 0.72.0)
     ruby-enum (0.7.2)