Update dependency subscriptions-transport-ws to v0.9.19

Author: renovate-bot

package-lock.json

@@ -47,7 +47,7 @@
     "jest": "26.6.3",
     "nodemon": "2.0.7",
     "prettier": "2.3.1",
-    "subscriptions-transport-ws": "0.9.18",
+    "subscriptions-transport-ws": "0.9.19",
     "supertest": "6.1.3",
     "ts-jest": "26.5.6",
     "ts-node": "10.0.0",