chore(deps-functions): bump typescript from 5.9.3 to 6.0.3 in /functions

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]

functions/package-lock.json

@@ -25,7 +25,7 @@
   "devDependencies": {
     "@types/node": "^20.0.0",
     "firebase-functions-test": "^3.0.0",
-    "typescript": "^5.6.3"
+    "typescript": "^6.0.3"
   },
   "private": true
 }