Bump @types/express from 4.17.17 to 4.17.21 in /tools

Bumps [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express) from 4.17.17 to 4.17.21.
- [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] <[email protected]>

Author: dependabot[bot]

tools/package-lock.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "@types/chai": "^4.2.22",
-    "@types/express": "^4.17.13",
+    "@types/express": "^4.17.21",
     "@types/mocha": "^10.0.1",
     "@types/node": "^16.11.6",
     "@types/tv4": "^1.2.31",