Bump rubocop from 1.7.0 to 1.8.1 (#15573)

* Bump rubocop from 1.7.0 to 1.8.1

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v1.7.0...v1.8.1)

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

* Fix .codeclimate.yml

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

.codeclimate.yml

@@ -30,7 +30,7 @@ plugins:
     channel: eslint-7
   rubocop:
     enabled: true
-    channel: rubocop-1-70
+    channel: rubocop-1-8-1
   sass-lint:
     enabled: true
 exclude_patterns:

Gemfile

@@ -138,7 +138,7 @@ group :development do
   gem 'letter_opener', '~> 1.7'
   gem 'letter_opener_web', '~> 1.4'
   gem 'memory_profiler'
-  gem 'rubocop', '~> 1.7', require: false
+  gem 'rubocop', '~> 1.8', require: false
   gem 'rubocop-rails', '~> 2.9', require: false
   gem 'brakeman', '~> 4.10', require: false
   gem 'bundler-audit', '~> 0.7', require: false

Gemfile.lock

@@ -538,16 +538,16 @@ GEM
     rspec-support (3.10.1)
     rspec_junit_formatter (0.4.1)
       rspec-core (>= 2, < 4, != 2.12.0)
-    rubocop (1.7.0)
+    rubocop (1.8.1)
       parallel (~> 1.10)
-      parser (>= 2.7.1.5)
+      parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml
       rubocop-ast (>= 1.2.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (1.3.0)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.4.0)
       parser (>= 2.7.1.5)
     rubocop-rails (2.9.1)
       activesupport (>= 4.2.0)
@@ -786,7 +786,7 @@ DEPENDENCIES
   rspec-rails (~> 4.0)
   rspec-sidekiq (~> 3.1)
   rspec_junit_formatter (~> 0.4)
-  rubocop (~> 1.7)
+  rubocop (~> 1.8)
   rubocop-rails (~> 2.9)
   ruby-progressbar (~> 1.11)
   sanitize (~> 5.2)