Update require_ruby_version to 1.72 for plugin

RuboCop 1.72 or later is required for plugin support.

Author: koic

changelog/fix_require_rubocop_version_for_plugin.md

@@ -0,0 +1 @@
+* [#330](https://github.com/rubocop/rubocop-minitest/pull/330): Update `require_ruby_version` to 1.72 for plugin. ([@koic][])

rubocop-minitest.gemspec

@@ -34,6 +34,6 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_dependency 'lint_roller', '~> 1.1'
-  spec.add_dependency 'rubocop', '>= 1.61', '< 2.0'
+  spec.add_dependency 'rubocop', '>= 1.72', '< 2.0'
   spec.add_dependency 'rubocop-ast', '>= 1.38.0', '< 2.0'
 end