fix(deps): update dependency rxjs to v6.5.3

Author: renovate-bot

frontend/package.json

@@ -37,7 +37,7 @@
     "graphql": "14.4.2",
     "graphql-tag": "2.10.1",
     "hammerjs": "2.0.8",
-    "rxjs": "6.5.2",
+    "rxjs": "6.5.3",
     "tslib": "1.10.0",
     "zone.js": "0.9.1"
   },