Update README to reflect Vite 6 update

Author: l2dy

templates/rescript-template-vite/README.md

@@ -6,7 +6,7 @@ This is a Vite-based template with following setup:
 
 - [ReScript](https://rescript-lang.org) 11.0 with @rescript/react, [Core](https://github.com/rescript-association/rescript-core) and JSX v4
 - ES6 modules (ReScript code compiled to `.res.mjs` files)
-- Vite 4 with React Plugin (Fast Refresh)
+- Vite 6 with React Plugin (Fast Refresh)
 - Tailwind 4
 
 ## Development