Bump express from 4.17.1 to 4.17.3

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:production
...

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

package.json

@@ -20,7 +20,7 @@
         "@zeit/next-sass": "^1.0.1",
         "aws-sdk": "^2.817.0",
         "dayjs": "^1.9.7",
-        "express": "^4.17.1",
+        "express": "^4.17.3",
         "next": "9.4.4",
         "node-sass": "^4.14.1",
         "react": "16.13.1",