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>

Author: dependabot[bot]

package.json

@@ -57,7 +57,7 @@
         "apollo-client": "^2.6.4",
         "apollo-test-utils": "^0.3.2",
         "cors": "^2.8.4",
-        "express": "^4.17.1",
+        "express": "^4.17.3",
         "express-graphql": "^0.9.0",
         "graphql": "^14.5.8",
         "graphql-tag": "^2.10.1",