Merge branch 'deprecated-actiondispatch-paramsparser' into 'master'

Remove deprecated ActionDispatch::ParamsParser

See merge request gitlab-org/gitlab-ce!23848

changelogs/unreleased/deprecated-actiondispatch-paramsparser.yml

+---
+title: Remove deprecated ActionDispatch::ParamsParser
+merge_request: 23848
+author: Jasper Maes
+type: other

spec/lib/gitlab/middleware/read_only_spec.rb

@@ -8,7 +8,6 @@ describe Gitlab::Middleware::ReadOnly do
     rack = Rack::Builder.new do
       use ActionDispatch::Session::CacheStore
       use ActionDispatch::Flash
-      use ActionDispatch::ParamsParser
     end
 
     rack.run(subject)