feat(notifications): wire pruneDeadTokens into gameRetention

functions/src/notifications/gameRetention.ts

@@ -1,6 +1,7 @@
 import * as functions from 'firebase-functions'
 import * as admin from 'firebase-admin'
 import { recipientInQuietHours } from './quietHours'
+import { pruneDeadTokens } from './pruneTokens'
 
 const DAY_MS = 24 * 60 * 60 * 1000
 
@@ -233,6 +234,8 @@ async function sendNotification(
   if (failures.length > 0) {
     console.error(`[sendNotification] some notifications failed:`, failures)
   }
+
+  await pruneDeadTokens(db, notification.userId, tokens, sendResults)
 }
 
 async function getUserTokens(