Bump express from 4.17.1 to 4.17.3 (#1409)

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>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -70,7 +70,7 @@
     "escodegen": "^1.13.0",
     "espree": "^7.0.0",
     "estraverse": "^5.1.0",
-    "express": "^4.17.1",
+    "express": "^4.17.3",
     "front-matter": "^4.0.1",
     "fs-extra": "^9.0.0",
     "get-port": "^5.1.1",