chore(deps): [security] bump express in /tests/apps/dockerfile-procfile

Bumps [express](https://github.com/expressjs/express) from 2.5.11 to 4.17.1. **This update includes a security fix.**
- [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/2.5.11...4.17.1)

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

tests/apps/dockerfile-procfile/package.json

@@ -2,7 +2,7 @@
   "name": "node-example",
   "version": "0.0.1",
   "dependencies": {
-    "express": "2.5.x"
+    "express": "4.17.x"
   },
   "engines": {
     "node": "4.2.x"