Bump express from 4.17.1 to 4.20.0 in /example/basic-pug

Bumps [express](https://github.com/expressjs/express) from 4.17.1 to 4.20.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.17.1...4.20.0)

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

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

example/basic-pug/package.json

@@ -8,7 +8,7 @@
     "start": "node index.js"
   },
   "dependencies": {
-    "express": "4.17.1",
+    "express": "4.20.0",
     "i18next": "19.8.1",
     "i18next-http-middleware": "3.1.4",
     "i18next-fs-backend": "1.0.7",