Bump typescript from 5.8.3 to 5.9.3

Bumps [typescript](https://github.com/microsoft/TypeScript) from 5.8.3 to 5.9.3.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Changelog](https://github.com/microsoft/TypeScript/blob/main/azure-pipelines.release-publish.yml)
- [Commits](microsoft/TypeScript@v5.8.3...v5.9.3)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 5.9.3
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -20,7 +20,7 @@
     "@devvit/public-api": "0.12.0"
   },
   "devDependencies": {
-    "typescript": "5.8.3",
+    "typescript": "5.9.3",
     "vitest": "^3.2.4"
   }
 }