Update dependency apollo to v2.21.0

Author: renovate-bot

packages/controller/package.json

@@ -19,7 +19,7 @@
   "devDependencies": {
     "@types/node": "10.12.26",
     "@types/react": "16.8.3",
-    "apollo": "2.5.1",
+    "apollo": "2.21.0",
     "prettier": "1.16.4",
     "rimraf": "2.6.3",
     "typescript": "3.3.3"