Update dependency @types/express-serve-static-core to v4.19.6 (#4599)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [@types/express-serve-static-core](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/express-serve-static-core) ([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express-serve-static-core)) | [`5.0.7` -> `4.19.6`](https://renovatebot.com/diffs/npm/@types%2fexpress-serve-static-core/4.19.0/4.19.6) | [![age](https://developer.mend.io/api/mc/badges/age/npm/@types%2fexpress-serve-static-core/4.19.6?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@types%2fexpress-serve-static-core/4.19.0/4.19.6?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/X-oss-byte/Nextjs).

Author: renovate[bot]

packages/next/package.json

@@ -168,7 +168,7 @@
     "@types/cookie": "1.0.0",
     "@types/cross-spawn": "6.0.6",
     "@types/debug": "4.1.12",
-    "@types/express-serve-static-core": "5.0.7",
+    "@types/express-serve-static-core": "4.19.6",
     "@types/fresh": "0.5.3",
     "@types/glob": "9.0.0",
     "@types/jsonwebtoken": "9.0.10",