Fix ShaAttribute to not have implicit dependency on DatabaseReflection

Includes DatabaseReflection for models which may not descend from
ApplicationRecord

app/models/concerns/sha_attribute.rb

@@ -3,6 +3,9 @@
 module ShaAttribute
   extend ActiveSupport::Concern
 
+  # Needed for the database method
+  include DatabaseReflection
+
   class_methods do
     def sha_attribute(name)
       return if ENV['STATIC_VERIFICATION']

spec/models/concerns/sha_attribute_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe ShaAttribute do
-  let(:model) { Class.new(ApplicationRecord) { include ShaAttribute } }
+  let(:model) { Class.new(ActiveRecord::Base) { include ShaAttribute } }
 
   before do
     columns = [