Bump express from 4.19.2 to 4.21.1

Bumps [express](https://github.com/expressjs/express) from 4.19.2 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@4.19.2...4.21.1)

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

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

package.json

@@ -18,7 +18,7 @@
         "url": "https://github.com/roncli/hot-router.git"
     },
     "dependencies": {
-        "express": "4.19.2"
+        "express": "4.21.1"
     },
     "devDependencies": {
         "@babel/core": "7.26.0",