Stop using Fake Redis gem

We have Redis locally and in CI so we don't need to fake it.

spec/rails_helper.rb

@@ -8,7 +8,6 @@
 abort("The Rails environment is running in production mode!") if Rails.env.production?
 require "rspec/rails"
 # Add additional requires below this line. Rails is not loaded until this point!
-require "fakeredis/rspec"
 
 # testing strip_attributes
 require "strip_attributes/matchers"