Update minitest requirement from 5.25.1 to 5.25.4

Updates the requirements on [minitest](https://github.com/minitest/minitest) to permit the latest version.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.25.1...v5.25.4)

---
updated-dependencies:
- dependency-name: minitest
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Gemfile

@@ -2,7 +2,7 @@
 
 source 'https://rubygems.org'
 
-gem 'minitest', '5.25.1'
+gem 'minitest', '5.25.4'
 gem 'rouge', '4.3.0'
 gem 'rubocop', '1.66.1'
 gem 'rubocop-minitest', '0.36.0'