fix(deps): update dependency graphql-tools to v8

Author: renovate-bot

packages/backend/package.json

@@ -32,7 +32,7 @@
     "@prisma/client": "2.28.0",
     "apollo-server-express": "2.25.2",
     "graphql": "15.5.1",
-    "graphql-tools": "7.0.5",
+    "graphql-tools": "8.1.0",
     "mysql": "2.18.1",
     "prisma": "2.28.0",
     "reflect-metadata": "0.1.13",