Remove specific dates in audit events spec

By default, the audit event search results are limited to the current
month. Having records created beyond that time range requires setting
the date filter or else they will not show up in the page.

The specific broken specs do not test date filter or order logic. Hence,
we could remove these dates.

ee/spec/features/projects/audit_events_spec.rb

@@ -175,9 +175,9 @@ RSpec.describe 'Projects > Audit Events', :js do
   end
 
   describe 'combined list of authenticated and unauthenticated users' do
-    let!(:audit_event_1) { create(:project_audit_event, :unauthenticated, entity_type: 'Project', entity_id: project.id, created_at: 5.days.ago) }
-    let!(:audit_event_2) { create(:project_audit_event, author_id: non_existing_record_id, entity_type: 'Project', entity_id: project.id, created_at: 3.days.ago) }
-    let!(:audit_event_3) { create(:project_audit_event, entity_type: 'Project', entity_id: project.id, created_at: Date.current) }
+    let!(:audit_event_1) { create(:project_audit_event, :unauthenticated, entity_type: 'Project', entity_id: project.id) }
+    let!(:audit_event_2) { create(:project_audit_event, author_id: non_existing_record_id, entity_type: 'Project', entity_id: project.id) }
+    let!(:audit_event_3) { create(:project_audit_event, entity_type: 'Project', entity_id: project.id) }
 
     it 'displays the correct authors names' do
       visit project_audit_events_path(project)