[real-time] reduce delay in test for faster CI VM (#28721)

GitOrigin-RevId: 34da567ca7101a8f5070e2bd20aba4f87b231b5b

services/real-time/test/acceptance/js/PubSubRace.js

@@ -310,7 +310,7 @@ describe('PubSubRace', function () {
               //  - disconnect goes through one process.nextTick
               // We have to inject the disconnect event into a different event loop
               //  cycle.
-              3
+              1
             )
           },