Fix linting issues

This fixes linting issues in the latest version of Rubocop.

db/migrate/20230224141607_change_assessment_references_verified.rb

@@ -2,10 +2,9 @@
 
 class ChangeAssessmentReferencesVerified < ActiveRecord::Migration[7.0]
   def change
-    change_column_null :assessments, :references_verified, true
-    change_column_default :assessments,
-                          :references_verified,
-                          from: false,
-                          to: nil
+    change_table :assessments, bulk: true do |t|
+      t.change_null :references_verified, true
+      t.change_default :references_verified, from: false, to: nil
+    end
   end
 end