Bump @types/express from 4.17.18 to 4.17.20

Bumps [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express) from 4.17.18 to 4.17.20.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/express)

---
updated-dependencies:
- dependency-name: "@types/express"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -70,7 +70,7 @@
     "@types/csurf": "^1.11.3",
     "@types/debug": "^4.1.9",
     "@types/ejs": "^3.1.3",
-    "@types/express": "^4.17.18",
+    "@types/express": "^4.17.20",
     "@types/express-session": "^1.17.8",
     "@types/gulp": "^4.0.14",
     "@types/gulp-changed": "^0.0.37",