fix: upgrade node-fetch from 2.6.2 to 2.6.4 (#1649)

Snyk has created this PR to upgrade node-fetch from 2.6.2 to 2.6.4.

See this package in npm:
https://www.npmjs.com/package/node-fetch

See this project in Snyk:
https://app.snyk.io/org/anikethsaha/project/6efe7e04-4e52-497e-8ad5-570733cc577a?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

packages/docsify-server-renderer/package-lock.json

@@ -18,7 +18,7 @@
     "debug": "^4.3.2",
     "docsify": "^4.12.1",
     "dompurify": "^2.3.2",
-    "node-fetch": "^2.6.2",
+    "node-fetch": "^2.6.4",
     "resolve-pathname": "^3.0.0"
   }
 }