Bump debug and express in /shop-ui

Bumps [debug](https://github.com/debug-js/debug) to 2.6.9 and updates ancestor dependency [express](https://github.com/expressjs/express). These dependencies need to be updated together.


Updates `debug` from 2.6.8 to 2.6.9
- [Release notes](https://github.com/debug-js/debug/releases)
- [Changelog](https://github.com/debug-js/debug/blob/2.6.9/CHANGELOG.md)
- [Commits](debug-js/debug@2.6.8...2.6.9)

Updates `express` from 4.15.4 to 4.18.2
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.15.4...4.18.2)

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

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

shop-ui/package.json

@@ -34,7 +34,7 @@
     "css-loader": "^0.28.0",
     "cssnano": "^3.10.0",
     "eventsource-polyfill": "^0.9.6",
-    "express": "^4.14.1",
+    "express": "^4.18.2",
     "extract-text-webpack-plugin": "^2.0.0",
     "file-loader": "^0.11.1",
     "friendly-errors-webpack-plugin": "^1.1.3",