Fix intermittent failure on ap/activity/update spec timestamp check (#33425)

spec/services/activitypub/process_status_update_service_spec.rb

@@ -307,7 +307,7 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService, type: :service do
           .to change { status.tags.reload.pluck(:name) }.from(%w(test foo)).to(%w(foo bar))
           .and change { status.account.featured_tags.find_by(name: 'test').statuses_count }.by(-1)
           .and change { status.account.featured_tags.find_by(name: 'bar').statuses_count }.by(1)
-          .and change { status.account.featured_tags.find_by(name: 'bar').last_status_at }.from(nil).to(be_within(0.1).of(Time.now.utc))
+          .and change { status.account.featured_tags.find_by(name: 'bar').last_status_at }.from(nil).to(be_present)
       end
     end