build(deps): bump express in /examples/repository-mode

Bumps [express](https://github.com/expressjs/express) from 4.16.4 to 4.17.3.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.16.4...4.17.3)

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

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

Author: dependabot[bot]

examples/repository-mode/package-lock.json

@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "body-parser": "^1.18.3",
-    "express": "^4.16.4",
+    "express": "^4.17.3",
     "sequelize": "^5.22.5",
     "sequelize-typescript": "^1.0.0-alpha.9",
     "strong-error-handler": "^3.2.0"