chore(deps): update dependency mocha to v7 (#330)

Author: renovate-bot

cloud-tasks/package.json

@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "mocha": "^6.1.3",
+    "mocha": "^7.0.0",
     "uuid": "^3.3.2"
   }
 }