Add support to Rails 7.1

The railties dependency was blocking compatibility with a new version,
after allowing it should be fine.

Fixes #180

meta_request/meta_request.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |gem|
   gem.license      = 'MIT'
 
   gem.add_dependency 'rack-contrib', '>= 1.1', '< 3'
-  gem.add_dependency 'railties', '>= 3.0.0', '< 7.1'
+  gem.add_dependency 'railties', '>= 3.0.0', '<= 7.1'
   gem.add_development_dependency 'rspec', '~> 3.8.0'
   gem.add_development_dependency 'rubocop', '~> 0.74.0'