Update rubocop-minitest requirement from ~> 0.31.0 to ~> 0.32.1

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@v0.31.0...v0.32.1)

---
updated-dependencies:
- dependency-name: rubocop-minitest
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

smart_proxy_hdm.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'mocha', '~> 2.0', '>= 2.0.4'
   s.add_development_dependency 'rake', '~> 13.0', '>= 13.0.6'
   s.add_development_dependency 'rubocop', '~> 1.52', '>= 1.52.1'
-  s.add_development_dependency 'rubocop-minitest', '~> 0.31.0'
+  s.add_development_dependency 'rubocop-minitest', '~> 0.32.1'
   s.add_development_dependency 'rubocop-performance', '~> 1.18'
   s.add_development_dependency 'rubocop-rails', '~> 2.19', '>= 2.19.1'
   s.add_development_dependency 'rubocop-rake', '~> 0.6.0'