chore(deps): Bump typescript in /functions/newsletter

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 5.1.3 to 5.3.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v5.1.3...v5.3.3)

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

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

functions/newsletter/package.json

@@ -17,6 +17,6 @@
     "@netlify/functions": "^1.6.0",
     "@types/node": "^20.7.0",
     "node-fetch": "^3.3.0",
-    "typescript": "^5.1.3"
+    "typescript": "^5.3.3"
   }
 }