Bump rubocop-rails from 2.14.2 to 2.15.0 in /dependencies (#3051)

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:production
  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>

dependencies/Gemfile

@@ -7,5 +7,5 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 gem "rubocop", "~> 1.30.1"
 gem "rubocop-github", "~> 0.17.0"
 gem "rubocop-performance", "~>1.14.2"
-gem "rubocop-rails", "~> 2.14"
+gem "rubocop-rails", "~> 2.15"
 gem "rubocop-rspec", "~> 2.11.1"

dependencies/Gemfile.lock

@@ -10,7 +10,7 @@ GEM
     concurrent-ruby (1.1.10)
     i18n (1.10.0)
       concurrent-ruby (~> 1.0)
-    minitest (5.15.0)
+    minitest (5.16.1)
     parallel (1.22.1)
     parser (3.1.2.0)
       ast (~> 2.4.1)
@@ -36,7 +36,7 @@ GEM
     rubocop-performance (1.14.2)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.14.2)
+    rubocop-rails (2.15.0)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
@@ -54,7 +54,7 @@ DEPENDENCIES
   rubocop (~> 1.30.1)
   rubocop-github (~> 0.17.0)
   rubocop-performance (~> 1.14.2)
-  rubocop-rails (~> 2.14)
+  rubocop-rails (~> 2.15)
   rubocop-rspec (~> 2.11.1)
 
 BUNDLED WITH