Bump typescript from 5.9.3 to 6.0.3 in /src/Elastic.Documentation.Site

Bumps [typescript](https://github.com/microsoft/TypeScript) from 5.9.3 to 6.0.3.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v5.9.3...v6.0.3)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 6.0.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Elastic.Documentation.Site/package-lock.json

@@ -90,7 +90,7 @@
     "react-dom": "18.3.1",
     "svgo": "^4.0.1",
     "text-diff": "1.0.1",
-    "typescript": "^5.9.3",
+    "typescript": "^6.0.3",
     "typescript-eslint": "8.59.1",
     "wait-on": "9.0.5"
   },