build(deps-dev): bump typescript in /clients/js-legacy

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]

clients/js-legacy/package.json

@@ -84,7 +84,7 @@
         "shx": "^0.4.0",
         "ts-node": "^10.9.2",
         "typedoc": "^0.28.0",
-        "typescript": "^5.7.2"
+        "typescript": "^6.0.3"
     },
     "prettier": "@solana/prettier-config-solana"
 }