Bump express in /legacy/react-webpack-ts-babel-multi-bundles

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](expressjs/express@4.17.1...4.17.3)

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

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

Author: dependabot[bot]

legacy/react-webpack-ts-babel-multi-bundles/package.json

@@ -81,7 +81,7 @@
         "eslint-plugin-prettier": "^3.0.1",
         "eslint-plugin-react": "^7.12.4",
         "eslint-plugin-react-hooks": "^2.0.1",
-        "express": "^4.17.1",
+        "express": "^4.17.3",
         "file-loader": "^2.0.0",
         "fs-extra": "^8.1.0",
         "globby": "^10.0.1",