Update ruby-mysql requirement from ~> 2.9.14, >= 2.9.0 to >= 2.9.14, …

…< 4.2.0

Updates the requirements on [ruby-mysql](https://gitlab.com/tmtms/ruby-mysql) to permit the latest version.
- [Changelog](https://gitlab.com/tmtms/ruby-mysql/blob/master/CHANGELOG.md)
- [Commits](https://gitlab.com/tmtms/ruby-mysql/compare/2.9.14...v4.1.0)

---
updated-dependencies:
- dependency-name: ruby-mysql
  dependency-type: direct:production
...

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

nose.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'rake', '~> 12.3.2', '>= 12.0.0'
   s.add_dependency 'representable', '~> 3.2.0', '>= 3.0.0'
   s.add_dependency 'ruby-graphviz', '~> 1.2.2', '>= 1.2.0'
-  s.add_dependency 'ruby-mysql', '~> 2.9.14', '>= 2.9.0' # for the proxy because it's pure Ruby
+  s.add_dependency 'ruby-mysql', '>= 2.9.14', '< 4.2.0' # for the proxy because it's pure Ruby
   s.add_dependency 'sequel', '~> 5.41.0', '>= 4.46.0'
   s.add_dependency 'smarter_csv', '1.10.2'
   s.add_dependency 'sorted_set', '~> 1.0', '>= 1.0.3'