build(deps): bump node-fetch from 2.6.0 to 2.6.7 in /server

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) from 2.6.0 to 2.6.7.
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.6.0...v2.6.7)

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

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

Author: dependabot[bot]

server/package-lock.json

@@ -25,7 +25,7 @@
     "lodash.pick": "^4.4.0",
     "mongodb": "^3.5.5",
     "mongoose": "^5.9.7",
-    "node-fetch": "2.6.0",
+    "node-fetch": "2.6.7",
     "react": "^16.13.1",
     "serve-static": "^1.14.1",
     "webpack": "^4.42.1"