warning: Rack::Utils::HeaderHash is deprecated and will be removed in Rack 3.1, switch to Rack::Headers

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/app/vendor/bundle/ruby/3.3.0/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:164: 
warning: Rack::Utils::HeaderHash is deprecated and will be removed in Rack 3.1, switch to Rack::Headers`

cyu/rack-cors#251

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I've created #73 to update the gem and make it compatible with Rack v13