DEV: Update rubocop-discourse (#30552)

…and autofix the issues

plugins/automation/spec/scripts/topic_spec.rb

@@ -3,7 +3,7 @@
 describe "Topic" do
   let!(:raw) { "this is me testing a new topic by automation" }
   let!(:title) { "This is a new topic created by automation" }
-  fab!(:category) { Fabricate(:category) }
+  fab!(:category)
   fab!(:tag1) { Fabricate(:tag) }
   fab!(:tag2) { Fabricate(:tag) }
 

plugins/automation/spec/services/discourse_automation/destroy_spec.rb

@@ -9,14 +9,14 @@ RSpec.describe DiscourseAutomation::Destroy do
     subject(:result) { described_class.call(params:, **dependencies) }
 
     fab!(:user) { Fabricate(:admin) }
-    fab!(:automation) { Fabricate(:automation) }
+    fab!(:automation)
 
     let(:guardian) { user.guardian }
     let(:params) { { automation_id: automation.id } }
     let(:dependencies) { { guardian: } }
 
     context "when user can't destroy the automation" do
-      fab!(:user) { Fabricate(:user) }
+      fab!(:user)
 
       it { is_expected.to fail_a_policy(:can_destroy_automation) }
     end