Update dependency minitest to '~> 5.26.0' (#74)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Gemfile

@@ -11,7 +11,7 @@ group :test do
   gem 'foodcritic', '~> 16.0'
   gem 'cookstyle', '~> 7'
   gem 'coveralls', require: false
-  gem 'minitest', '~> 5.25.0'
+  gem 'minitest', '~> 5.26.0'
   gem 'simplecov', '~> 0.10'
 end