chore(deps)(deps): bump express and @types/express

Bumps [express](https://github.com/expressjs/express) and [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express). These dependencies needed to be updated together.

Updates `express` from 4.21.2 to 5.2.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](https://github.com/expressjs/express/compare/4.21.2...v5.2.1)

Updates `@types/express` from 4.17.23 to 5.0.6
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/express)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 5.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/express"
  dependency-version: 5.0.6
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

packages/browser-tests/package.json

@@ -24,13 +24,13 @@
     "@waku/utils": "0.0.27",
     "cors": "^2.8.5",
     "dotenv-flow": "^0.4.0",
-    "express": "^4.21.2",
+    "express": "^5.2.1",
     "filter-obj": "^2.0.2",
     "it-first": "^3.0.9"
   },
   "devDependencies": {
     "@types/cors": "^2.8.15",
-    "@types/express": "^4.17.21",
+    "@types/express": "^5.0.6",
     "@types/node": "^20.10.0",
     "@waku/tests": "*",
     "axios": "^1.8.4",