Bump node-fetch in /extensions/microsoft-authentication (#141536)

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](https://github.com/node-fetch/node-fetch/compare/v2.6.1...v2.6.7)

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

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extensions/microsoft-authentication/package.json

@@ -55,7 +55,7 @@
   },
   "dependencies": {
     "buffer": "^5.6.0",
-    "node-fetch": "2.6.1",
+    "node-fetch": "2.6.7",
     "randombytes": "~2.1.0",
     "sha.js": "2.4.11",
     "stream": "0.0.2",