Bump express from 4.17.2 to 4.17.3

Bumps [express](https://github.com/expressjs/express) from 4.17.2 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/4.17.2...4.17.3)

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

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

package.json

@@ -57,7 +57,7 @@
     "cookie-parser": "^1.4.6",
     "create-react-class": "^15.7.0",
     "dedent-tabs": "^0.10.1",
-    "express": "^4.17.2",
+    "express": "^4.17.3",
     "express-async-handler": "^1.2.0",
     "express-static-gzip": "2.1.4",
     "fs-extra": "10.0.0",