Bump rubocop-rails from 2.18.0 to 2.19.1 (#947)

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.18.0 to 2.19.1.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.18.0...v2.19.1)

---
updated-dependencies:
- dependency-name: rubocop-rails
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -187,7 +187,7 @@ GEM
     globalid (1.1.0)
       activesupport (>= 5.0)
     highline (2.1.0)
-    i18n (1.12.0)
+    i18n (1.13.0)
       concurrent-ruby (~> 1.0)
     i18n-tasks (1.0.12)
       activesupport (>= 4.0.2)
@@ -292,7 +292,7 @@ GEM
     raabro (1.4.0)
     racc (1.6.2)
     racc (1.6.2-java)
-    rack (2.2.6.4)
+    rack (2.2.7)
     rack-mini-profiler (3.0.0)
       rack (>= 1.2.0)
     rack-test (2.1.0)
@@ -368,7 +368,7 @@ GEM
     rubocop-performance (1.16.0)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.18.0)
+    rubocop-rails (2.19.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)