Update rubocop-minitest requirement from = 0.30.0 to = 0.31.0

Updates the requirements on [rubocop-minitest](https://github.com/rubocop/rubocop-minitest) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-minitest/releases)
- [Changelog](https://github.com/rubocop/rubocop-minitest/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-minitest@v0.30.0...v0.31.0)

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

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

Gemfile.lock

@@ -16,8 +16,8 @@ GEM
     json (2.6.3)
     method_source (1.0.0)
     minitest (5.18.0)
-    parallel (1.22.1)
-    parser (3.2.2.0)
+    parallel (1.23.0)
+    parser (3.2.2.1)
       ast (~> 2.4.1)
     power_assert (2.0.3)
     pry (0.14.2)
@@ -37,9 +37,9 @@ GEM
       rubocop-ast (>= 1.28.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.28.0)
+    rubocop-ast (1.28.1)
       parser (>= 3.2.1.0)
-    rubocop-minitest (0.30.0)
+    rubocop-minitest (0.31.0)
       rubocop (>= 1.39, < 2.0)
     rubocop-rake (0.6.0)
       rubocop (~> 1.0)
@@ -65,7 +65,7 @@ DEPENDENCIES
   pry (= 0.14.2)
   rake (= 13.0.6)
   rubocop (= 1.50.2)
-  rubocop-minitest (= 0.30.0)
+  rubocop-minitest (= 0.31.0)
   rubocop-rake (= 0.6.0)
   simplecov (= 0.22.0)
   test-unit (= 3.5.8)

faker.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency('pry', '0.14.2')
   spec.add_development_dependency('rake', '13.0.6')
   spec.add_development_dependency('rubocop', '1.50.2')
-  spec.add_development_dependency('rubocop-minitest', '0.30.0')
+  spec.add_development_dependency('rubocop-minitest', '0.31.0')
   spec.add_development_dependency('rubocop-rake', '0.6.0')
   spec.add_development_dependency('simplecov', '0.22.0')
   spec.add_development_dependency('test-unit', '3.5.8')