Update rubocop requirement from = 1.18.3 to = 1.18.4 (#2362)

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.18.3...v1.18.4)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

Gemfile.lock

@@ -27,13 +27,13 @@ GEM
     rake (13.0.6)
     regexp_parser (2.1.1)
     rexml (3.2.5)
-    rubocop (1.18.3)
+    rubocop (1.18.4)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.7.0, < 2.0)
+      rubocop-ast (>= 1.8.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.8.0)
@@ -58,7 +58,7 @@ DEPENDENCIES
   minitest (= 5.14.4)
   pry (= 0.14.1)
   rake (= 13.0.6)
-  rubocop (= 1.18.3)
+  rubocop (= 1.18.4)
   simplecov (= 0.17.1, < 0.18)
   test-unit (= 3.4.4)
   timecop (= 0.9.4)

faker.gemspec

@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency('minitest', '5.14.4')
   spec.add_development_dependency('pry', '0.14.1')
   spec.add_development_dependency('rake', '13.0.6')
-  spec.add_development_dependency('rubocop', '1.18.3')
+  spec.add_development_dependency('rubocop', '1.18.4')
   # Workaround for cc-test-reporter with SimpleCov 0.18.
   # Stop upgrading SimpleCov until the following issue will be resolved.
   # https://github.com/codeclimate/test-reporter/issues/418