Upgrade rubocop to 0.85.1 (#8360) [deploy]

Fixes an erb-lint issue (`undefined method reject for #<RuboCop::Cop::Registry:0x000055f48b351dc8>`).
See https://github.com/Shopify/erb-lint/issues/174 for more.

Gemfile

@@ -138,7 +138,7 @@ group :development, :test do
   gem "parallel_tests", "~> 2.32" # Run Test::Unit / RSpec / Cucumber / Spinach in parallel
   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", "~> 0.85", require: false # Automatic Ruby code style checking tool
+  gem "rubocop", "~> 0.85.1", require: false # Automatic Ruby code style checking tool
   gem "rubocop-performance", "~> 1.6", require: false # A collection of RuboCop cops to check for performance optimizations in Ruby code
   gem "rubocop-rails", "~> 2.5", require: false # Automatic Rails code style checking tool
   gem "rubocop-rspec", "~> 1.39", require: false # Code style checking for RSpec files

Gemfile.lock

@@ -685,7 +685,7 @@ GEM
     rspec-retry (0.6.2)
       rspec-core (> 3.3)
     rspec-support (3.9.3)
-    rubocop (0.85.0)
+    rubocop (0.85.1)
       parallel (~> 1.10)
       parser (>= 2.7.0.1)
       rainbow (>= 2.2.2, < 4.0)
@@ -980,7 +980,7 @@ DEPENDENCIES
   rouge (~> 3.19)
   rspec-rails (~> 4.0)
   rspec-retry (~> 0.6)
-  rubocop (~> 0.85)
+  rubocop (~> 0.85.1)
   rubocop-performance (~> 1.6)
   rubocop-rails (~> 2.5)
   rubocop-rspec (~> 1.39)