Bump @types/express from 4.17.12 to 4.17.13

Bumps [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express) from 4.17.12 to 4.17.13.
- [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

@@ -41,7 +41,7 @@
     "smtp-server": "^3.9.0"
   },
   "devDependencies": {
-    "@types/express": "^4.17.12",
+    "@types/express": "^4.17.13",
     "@types/node": "^15.6.1",
     "@typescript-eslint/eslint-plugin": "^4.22.1",
     "@typescript-eslint/parser": "^4.26.1",