Orphaned rubygem-json_pure

Hello, I have removed dependencies on rubygem-json_pure from rubygem-morph-cli and rubygem-multi_json, therefore nothing else depended on rubygem-json_pure. There is no real need for rubzgem-json_pure in Fedora, since jruby is long gone and ruby can use the binary rubygem-json, which is more performant, therefore I orphaned rubygem-json_pure. Vít