databases/rubygem-mario-redis-lock: patch to pull in databases/rubygem-redis

After r457876 and r457886, net-im/mastodon failed to start because of an
issue with both versions 3 and 4 of the redis gems being pulled in.

/usr/local/lib/ruby/gems/2.4/gems/bundler-1.16.1/lib/bundler/runtime.rb:313:in
`check_for_activated_spec!': You have already activated redis 4.0.1, but
your Gemfile requires redis 3.3.5.