Summary

Upgrade the typescript dependency from version 5.6.3 to 5.9.3 in the website.

Related PR

• Bump typescript from 5.6.3 to 5.9.3 in /website #1888

Parent Issue

• [Features parity] Dependencies #1817

Details

This is a minor version upgrade created by Dependabot. TypeScript 5.9 includes
various new features and improvements. See the
TypeScript 5.9 announcement
for migration details.