Update dependency @types/eslint to v9 (#33928)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@types/eslint](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/eslint) ([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/eslint)) | devDependencies | major | [`^8.56.0` -> `^9.0.0`](https://renovatebot.com/diffs/npm/@types%2feslint/8.56.12/9.6.1) |

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GitOrigin-RevId: a9fec750c58e1397150b73c9f069632f945f0271

Author: convex-renovate-runner[bot]

npm-packages/private-demos/quickstarts/sveltekit/package.json

@@ -15,7 +15,7 @@
 		"@sveltejs/adapter-auto": "^3.0.0",
 		"@sveltejs/kit": "^2.0.0",
 		"@sveltejs/vite-plugin-svelte": "^3.0.0",
-		"@types/eslint": "^8.56.0",
+		"@types/eslint": "^9.0.0",
 		"@typescript-eslint/eslint-plugin": "^7.0.0",
 		"@typescript-eslint/parser": "^7.0.0",
 		"eslint": "^8.56.0",