Bump rubocop from 1.3.1 to 1.7.0 (#15447)

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 1.3.1 to 1.7.0.
- [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/v1.3.1...v1.7.0)

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

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

Gemfile

@@ -138,7 +138,7 @@ group :development do
   gem 'letter_opener', '~> 1.7'
   gem 'letter_opener_web', '~> 1.4'
   gem 'memory_profiler'
-  gem 'rubocop', '~> 1.3', require: false
+  gem 'rubocop', '~> 1.7', require: false
   gem 'rubocop-rails', '~> 2.8', require: false
   gem 'brakeman', '~> 4.10', require: false
   gem 'bundler-audit', '~> 0.7', require: false

Gemfile.lock

@@ -397,7 +397,7 @@ GEM
     parallel (1.20.1)
     parallel_tests (3.4.0)
       parallel
-    parser (2.7.2.0)
+    parser (3.0.0.0)
       ast (~> 2.4.1)
     parslet (2.0.0)
     pastel (0.8.0)
@@ -535,16 +535,16 @@ GEM
     rspec-support (3.9.3)
     rspec_junit_formatter (0.4.1)
       rspec-core (>= 2, < 4, != 2.12.0)
-    rubocop (1.3.1)
+    rubocop (1.7.0)
       parallel (~> 1.10)
       parser (>= 2.7.1.5)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8)
+      regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.1.1)
+      rubocop-ast (>= 1.2.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (1.1.1)
+    rubocop-ast (1.3.0)
       parser (>= 2.7.1.5)
     rubocop-rails (2.8.1)
       activesupport (>= 4.2.0)
@@ -783,7 +783,7 @@ DEPENDENCIES
   rspec-rails (~> 4.0)
   rspec-sidekiq (~> 3.1)
   rspec_junit_formatter (~> 0.4)
-  rubocop (~> 1.3)
+  rubocop (~> 1.7)
   rubocop-rails (~> 2.8)
   ruby-progressbar (~> 1.10)
   sanitize (~> 5.2)