chore(deps): bump express from 4.21.2 to 5.1.0 in /tests/apps/dockerfile

Bumps [express](https://github.com/expressjs/express) from 4.21.2 to 5.1.0.
- [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...v5.1.0)

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

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

tests/apps/dockerfile/package.json

@@ -7,7 +7,7 @@
     "start": "node index.js"
   },
   "dependencies": {
-    "express": "^4.0.0"
+    "express": "^5.1.0"
   },
   "engines": {
     "node": "4.2.x"