Bump express from 4.16.4 to 4.17.2

Bumps [express](https://github.com/expressjs/express) from 4.16.4 to 4.17.2.
- [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/4.16.4...4.17.2)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

packages/backend/package.json

@@ -63,7 +63,7 @@
     "data-uri-to-buffer": "^3.0.1",
     "data-uri-to-file": "^0.1.8",
     "dateformat": "3.0.3",
-    "express": "4.16.4",
+    "express": "4.17.2",
     "form-data": "^4.0.0",
     "formidable": "1.2.1",
     "jsonwebtoken": "8.5.1",