Require rails/generators explicitly

This resolves an issue where Rails::Generators::Base is not autoloaded leading to an error: NoMethodError:  undefined method `subclasses' for Rails::Generators:Module
The require for rails/generators/actions isn't needed because rails/generators autoloads it.

app/services/hyrax/database_migrator.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-require 'rails/generators/actions'
+require 'rails/generators'
 require 'rails/generators/active_record'
 
 module Hyrax