Bump rubocop from 0.87.1 to 0.88.0 (#9311)

Gemfile

@@ -140,7 +140,7 @@ group :development, :test do
   gem "knapsack_pro", "~> 2.0.0" # Help parallelize Ruby spec builds
   gem "pry-byebug", "~> 3.8" # Combine 'pry' with 'byebug'. Adds 'step', 'next', 'finish', 'continue' and 'break' commands to control execution
   gem "rspec-rails", "~> 4.0" # rspec-rails is a testing framework for Rails 3+
-  gem "rubocop", "~> 0.87.1", require: false # Automatic Ruby code style checking tool
+  gem "rubocop", "~> 0.88.0", 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", "~> 2.6", require: false # Automatic Rails code style checking tool
   gem "rubocop-rspec", "~> 1.41", require: false # Code style checking for RSpec files

Gemfile.lock

@@ -696,7 +696,7 @@ GEM
     rspec-retry (0.6.2)
       rspec-core (> 3.3)
     rspec-support (3.9.3)
-    rubocop (0.87.1)
+    rubocop (0.88.0)
       parallel (~> 1.10)
       parser (>= 2.7.1.1)
       rainbow (>= 2.2.2, < 4.0)
@@ -993,7 +993,7 @@ DEPENDENCIES
   rouge (~> 3.20)
   rspec-rails (~> 4.0)
   rspec-retry (~> 0.6)
-  rubocop (~> 0.87.1)
+  rubocop (~> 0.88.0)
   rubocop-performance (~> 1.7)
   rubocop-rails (~> 2.6)
   rubocop-rspec (~> 1.41)