Bump express from 4.16.2 to 4.16.4 (#5202)

Bumps [express](https://github.com/expressjs/express) from 4.16.2 to 4.16.4.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.16.2...4.16.4)

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

package.json

@@ -27,7 +27,7 @@
     "body-parser": "1.18.3",
     "commander": "2.19.0",
     "deepcopy": "1.0.0",
-    "express": "4.16.2",
+    "express": "4.16.4",
     "follow-redirects": "1.5.9",
     "intersect": "1.0.1",
     "lodash": "4.17.11",