Fix RubyGems deprecation warning in the gem package task.
Fix RubyGems deprecation warning in the gem package task.

kewaunited/passenger,openSUSE/passenger,bf4/passenger,antek-drzewiecki/passenger,kewaunited/passenger,gravitystorm/passenger,fabiokung/passenger-debian,antek-drzewiecki/passenger,pkmiec/passenger,bf4/passenger,fabiokung/passenger-debian,phusion/passenger,jawj/passenger,bf4/passenger,jawj/passenger,phusion/passenger,kewaunited/passenger,bf4/passenger,jawj/passenger,clemensg/passenger,erikogan/passenger,kewaunited/passenger,gravitystorm/passenger,phusion/passenger,antek-drzewiecki/passenger,pkmiec/passenger,gravitystorm/passenger,gravitystorm/passenger,cgvarela/passenger,pkmiec/passenger,clemensg/passenger,fabiokung/passenger-debian,pkmiec/passenger,openSUSE/passenger,openSUSE/passenger,clemensg/passenger,kewaunited/passenger,phusion/passenger,clemensg/passenger,jawj/passenger,clemensg/passenger,phusion/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,erikogan/passenger,kewaunited/passenger,jawj/passenger,antek-drzewiecki/passenger,clemensg/passenger,pkmiec/passenger,jawj/passenger,fabiokung/passenger-debian,cgvarela/passenger,bf4/passenger,openSUSE/passenger,cgvarela/passenger,openSUSE/passenger,gravitystorm/passenger,antek-drzewiecki/passenger,cgvarela/passenger,kewaunited/passenger,fabiokung/passenger-debian,erikogan/passenger,jawj/passenger,cgvarela/passenger,phusion/passenger,erikogan/passenger,pkmiec/passenger,fabiokung/passenger-debian,cgvarela/passenger,phusion/passenger,erikogan/passenger,gravitystorm/passenger,pkmiec/passenger,bf4/passenger,kewaunited/passenger,cgvarela/passenger,cgvarela/passenger,bf4/passenger,clemensg/passenger,clemensg/passenger,openSUSE/passenger,erikogan/passenger,phusion/passenger,antek-drzewiecki/passenger