Bump express from 4.17.1 to 4.17.3

Bumps [express](https://github.com/expressjs/express) from 4.17.1 to 4.17.3.
- [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/4.17.1...4.17.3)

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

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

packages/design-to-code/package.json

@@ -65,7 +65,7 @@
     "css-loader": "^4.2.0",
     "eslint-config-prettier": "^6.10.1",
     "esm": "^3.2.25",
-    "express": "4.17.1",
+    "express": "4.17.3",
     "file-loader": "^6.0.0",
     "html-webpack-plugin": "^3.2.0",
     "istanbul": "^0.4.5",