Update dependency @types/express-serve-static-core to v4.19.6 (#3407)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | 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)) | [`5.0.2` -> `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/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@types%2fexpress-serve-static-core/4.19.6?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@types%2fexpress-serve-static-core/4.19.0/4.19.6?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/) |

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packages/next/package.json

@@ -168,7 +168,7 @@
     "@types/cookie": "0.6.0",
     "@types/cross-spawn": "6.0.6",
     "@types/debug": "4.1.12",
-    "@types/express-serve-static-core": "5.0.2",
+    "@types/express-serve-static-core": "4.19.6",
     "@types/fresh": "0.5.2",
     "@types/glob": "8.1.0",
     "@types/jsonwebtoken": "9.0.7",