Bump ws from 8.19.0 to 8.21.0

Bumps [ws](https://github.com/websockets/ws) from 8.19.0 to 8.21.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.19.0...8.21.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -9,6 +9,6 @@
   },
   "dependencies": {
     "pg": "^8.20.0",
-    "ws": "^8.19.0"
+    "ws": "^8.21.0"
   }
 }