Bump express from 4.18.3 to 4.21.1 in /node

Bumps [express](https://github.com/expressjs/express) from 4.18.3 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@4.18.3...4.21.1)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

node/package.json

@@ -24,7 +24,7 @@
         "chart.js": "4.4.6",
         "clipboard": "2.0.11",
         "compression": "1.7.5",
-        "express": "4.18.3",
+        "express": "4.21.1",
         "express-ws": "5.0.2",
         "hot-router": "1.0.3",
         "html-minifier-terser": "7.2.0",