fix(deps): update apollo graphql packages (#447)

Author: renovate[bot]

packages/sync/package.json

@@ -49,10 +49,10 @@
   },
   "dependencies": {
     "@aerogear/core": "2.8.0",
-    "apollo-cache": "1.3.2",
-    "apollo-cache-inmemory": "1.6.3",
+    "apollo-cache": "1.3.4",
+    "apollo-cache-inmemory": "1.6.5",
     "apollo-cache-persist": "0.1.1",
-    "apollo-client": "2.6.4",
+    "apollo-client": "2.6.8",
     "apollo-link": "1.2.13",
     "apollo-link-context": "1.0.19",
     "apollo-link-http": "1.5.16",