Bump express from 4.19.2 to 4.20.0 in /example/fallback (#53)

Bumps [express](https://github.com/expressjs/express) from 4.19.2 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@4.19.2...4.20.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

example/fallback/package.json

@@ -7,6 +7,6 @@
     "i18next-http-backend": "1.2.4"
   },
   "devDependencies": {
-    "express": "4.19.2"
+    "express": "4.20.0"
   }
 }