Bump rubocop-rails from 2.5.2 to 2.6.0 (#14047)

Bumps [rubocop-rails](https://github.com/rubocop-hq/rubocop-rails) from 2.5.2 to 2.6.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-rails/compare/v2.5.2...v2.6.0)

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

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

Gemfile

@@ -140,7 +140,7 @@ group :development do
   gem 'letter_opener_web', '~> 1.4'
   gem 'memory_profiler'
   gem 'rubocop', '~> 0.85', require: false
-  gem 'rubocop-rails', '~> 2.5', require: false
+  gem 'rubocop-rails', '~> 2.6', require: false
   gem 'brakeman', '~> 4.8', require: false
   gem 'bundler-audit', '~> 0.6', require: false
 

Gemfile.lock

@@ -555,10 +555,10 @@ GEM
       unicode-display_width (>= 1.4.0, < 2.0)
     rubocop-ast (0.0.3)
       parser (>= 2.7.0.1)
-    rubocop-rails (2.5.2)
-      activesupport
+    rubocop-rails (2.6.0)
+      activesupport (>= 4.2.0)
       rack (>= 1.1)
-      rubocop (>= 0.72.0)
+      rubocop (>= 0.82.0)
     ruby-progressbar (1.10.1)
     ruby-saml (1.11.0)
       nokogiri (>= 1.5.10)
@@ -773,7 +773,7 @@ DEPENDENCIES
   rspec-sidekiq (~> 3.0)
   rspec_junit_formatter (~> 0.4)
   rubocop (~> 0.85)
-  rubocop-rails (~> 2.5)
+  rubocop-rails (~> 2.6)
   ruby-progressbar (~> 1.10)
   sanitize (~> 5.2)
   sidekiq (~> 6.0)