Bump node-fetch from 2.6.1 to 2.6.7

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>

Author: dependabot[bot]

package-lock.json

@@ -25,7 +25,7 @@
     "markdown-it": "^10.0.0",
     "markdown-it-anchor": "^7.0.2",
     "marked": "^1.2.9",
-    "node-fetch": "^2.6.1",
+    "node-fetch": "^2.6.7",
     "prismjs": "^1.23.0",
     "querystring": "^0.2.0",
     "sass": "^1.29.0"