Bump rubocop-rails from 2.14.2 to 2.15.0 (#18681)

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.14.2 to 2.15.0.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-rails/compare/v2.14.2...v2.15.0)

---
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

@@ -579,7 +579,7 @@ GEM
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.18.0)
       parser (>= 3.1.1.0)
-    rubocop-rails (2.14.2)
+    rubocop-rails (2.15.0)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
@@ -821,7 +821,7 @@ DEPENDENCIES
   rspec-sidekiq (~> 3.1)
   rspec_junit_formatter (~> 0.5)
   rubocop (~> 1.30)
-  rubocop-rails (~> 2.14)
+  rubocop-rails (~> 2.15)
   ruby-progressbar (~> 1.11)
   sanitize (~> 6.0)
   scenic (~> 1.6)