Fix JS package system

There are no docs telling you what to put, but fortunately they validated our config and told us what to put.

With Sannidhi!

[#172008513]

Author: Aakash Shah

.github/dependabot.yml

@@ -12,7 +12,7 @@ updates:
     interval: daily
     time: '11:00'
   open-pull-requests-limit: 10
-- package-ecosystem: javascript
+- package-ecosystem: npm
   directory: "/docs/v3"
   schedule:
     interval: daily