Bump send and express in /examples/client/javascript

Bumps [send](https://github.com/pillarjs/send) to 0.19.0 and updates ancestor dependency [express](https://github.com/expressjs/express). These dependencies need to be updated together.


Updates `send` from 0.18.0 to 0.19.0
- [Release notes](https://github.com/pillarjs/send/releases)
- [Changelog](https://github.com/pillarjs/send/blob/master/HISTORY.md)
- [Commits](pillarjs/send@0.18.0...0.19.0)

Updates `express` from 4.20.0 to 4.21.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.1/History.md)
- [Commits](expressjs/express@4.20.0...4.21.1)

---
updated-dependencies:
- dependency-name: send
  dependency-type: indirect
- dependency-name: express
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

examples/client/javascript/package.json

@@ -2,7 +2,7 @@
   "name": "socketio-examples",
   "version": "0.1.0",
   "dependencies": {
-    "express": "^4.20.0",
+    "express": "^4.21.1",
     "smoothie": "1.19.0",
     "socket.io": "^4.6.1",
     "socket.io-client": "^4.6.1"