Bump express from 4.20.0 to 4.21.0

Bumps [express](https://github.com/expressjs/express) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.0/History.md)
- [Commits](expressjs/express@4.20.0...4.21.0)

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

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

package.json

@@ -27,7 +27,7 @@
         "eslint": "~8.57.0",
         "eslint-plugin-html": "~8.1.0",
         "eslint-plugin-json-es": "~1.6.0",
-        "express": "~4.20.0",
+        "express": "~4.21.0",
         "node-red": "~4.0.2"
     },
     "node-red": {