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](https://github.com/expressjs/express/compare/4.20.0...4.21.0)

---
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

@@ -98,7 +98,7 @@
     "dedent-tabs": "^0.10.3",
     "dompurify": "^3.1.6",
     "expr-eval": "^2.0.2",
-    "express": "^4.20.0",
+    "express": "^4.21.0",
     "express-async-handler": "^1.2.0",
     "express-static-gzip": "2.1.7",
     "fs-extra": "11.2.0",