Bump node-fetch from 2.6.1 to 2.6.7 in /integration

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) from 2.6.1 to 2.6.7.
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.6.1...v2.6.7)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

integration/package.json

@@ -14,7 +14,7 @@
     "graphql-cli": "^3.0.14",
     "graphql-tag": "^2.11.0",
     "jest": "^24.9.0",
-    "node-fetch": "^2.6.1",
+    "node-fetch": "^2.6.7",
     "subscriptions-transport-ws": "^0.9.18",
     "ws": "^7.4.6"
   },