spec: add time for server to respond

This fixes some failing tests when upgrading to jQuery 3.5.

refs FOO-4260
flag=none

Test Plan:
- Jenkins Passes

[skip-crystalball]

Change-Id: I44f320f0cc768fb7123e8e2ac405d379cf2a7c20
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/341382
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Michael Hulse <michael.hulse@instructure.com>
QA-Review: Angela Gomba <angela.gomba@instructure.com>
Product-Review: Angela Gomba <angela.gomba@instructure.com>

spec/coffeescripts/quizzes/log_auditing/event_managerSpec.js

@@ -89,6 +89,7 @@ QUnit.module('Quizzes::LogAuditing::EventManager - Event delivery', {
 })
 
 test('it should deliver events', function () {
+  const clock = sinon.useFakeTimers()
   this.evtManager = new EventManager({
     autoDeliver: false,
     deliveryUrl: '/events',
@@ -112,8 +113,10 @@ test('it should deliver events', function () {
   )
   ok(this.evtManager.isDelivering(), 'it correctly reports whether a delivery is in progress')
   this.server.requests[0].respond(204)
+  clock.tick(1)
   ok(!this.evtManager.isDelivering(), "it untracks the delivery once it's synced with the server")
   ok(!this.evtManager.isDirty(), 'it flushes its buffer when sync is complete')
+  clock.restore()
 })
 
 test('should ignore EVT_PAGE_FOCUSED events that are not preceded by EVT_PAGE_BLURRED', function () {