Bump ws from 8.17.1 to 8.21.0 in /source (#18)

Bumps [ws](https://github.com/websockets/ws) from 8.17.1 to 8.21.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.17.1...8.21.0)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.21.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

source/package-lock.json

@@ -10,6 +10,6 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "ws": "^8.17.1"
+    "ws": "^8.21.0"
   }
 }