chore(deps-dev): bump typescript in /extensions/download-extension (#5405)

Bumps [typescript](https://github.com/microsoft/TypeScript) from 5.3.3 to 5.8.3.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Changelog](https://github.com/microsoft/TypeScript/blob/main/azure-pipelines.release-publish.yml)
- [Commits](https://github.com/microsoft/TypeScript/compare/v5.3.3...v5.8.3)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 5.8.3
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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extensions/download-extension/package.json

@@ -16,7 +16,7 @@
     "rimraf": "^3.0.2",
     "rolldown": "1.0.0-beta.1",
     "run-script-os": "^1.1.6",
-    "typescript": "5.3.3",
+    "typescript": "5.8.3",
     "vitest": "^3.0.6"
   },
   "files": [