Bump rubocop-rails from 2.7.1 to 2.8.0 (#10221)

* Bump rubocop-rails from 2.7.1 to 2.8.0

Bumps [rubocop-rails](https://github.com/rubocop-hq/rubocop-rails) from 2.7.1 to 2.8.0.
- [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/v2.7.1...v2.8.0)

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

* Bump rubocop-rails from 2.7.1 to 2.8.0 (Update vendor/cache)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile

@@ -143,7 +143,7 @@ group :development, :test do
   gem "rspec-rails", "~> 4.0" # rspec-rails is a testing framework for Rails 3+
   gem "rubocop", "~> 0.89.1", require: false # Automatic Ruby code style checking tool
   gem "rubocop-performance", "~> 1.7", require: false # A collection of RuboCop cops to check for performance optimizations in Ruby code
-  gem "rubocop-rails", "~> 2.7", require: false # Automatic Rails code style checking tool
+  gem "rubocop-rails", "~> 2.8", require: false # Automatic Rails code style checking tool
   gem "rubocop-rspec", "~> 1.43", require: false # Code style checking for RSpec files
   gem "spring", "~> 2.1" # Preloads your application so things like console, rake and tests run faster
   gem "spring-commands-rspec", "~> 1.0" # rspec command for spring

Gemfile.lock

@@ -470,7 +470,7 @@ GEM
     mini_portile2 (2.4.0)
     mini_racer (0.3.1)
       libv8 (~> 8.4.255)
-    minitest (5.14.1)
+    minitest (5.14.2)
     momentjs-rails (2.20.1)
       railties (>= 3.1)
     msgpack (1.3.3)
@@ -674,7 +674,7 @@ GEM
       parser (>= 2.7.1.4)
     rubocop-performance (1.7.1)
       rubocop (>= 0.82.0)
-    rubocop-rails (2.7.1)
+    rubocop-rails (2.8.0)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 0.87.0)
@@ -962,7 +962,7 @@ DEPENDENCIES
   rspec-retry (~> 0.6)
   rubocop (~> 0.89.1)
   rubocop-performance (~> 1.7)
-  rubocop-rails (~> 2.7)
+  rubocop-rails (~> 2.8)
   rubocop-rspec (~> 1.43)
   ruby-prof (~> 1.4)
   rubyzip (~> 2.3)