Bump express from 4.16.4 to 4.17.3

Bumps [express](https://github.com/expressjs/express) from 4.16.4 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/4.16.4...4.17.3)

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

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

package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "body-parser": "^1.18.3",
     "dotenv": "^6.2.0",
-    "express": "^4.16.4",
+    "express": "^4.17.3",
     "http-proxy-middleware": "^0.19.1",
     "moment": "^2.24.0",
     "morgan": "^1.9.1",