Flags SDK 4.2.3

Patch Changes

• #442 622d56e Thanks @dferber90! - Remove @sveltejs/kit from peer dependencies. It was declared as an optional peer with a "*" range, which caused npm to auto-install the newest @sveltejs/kit and drag in its transitive @sveltejs/vite-plugin-svelte → vite peer chain. In non-SvelteKit projects already on Vite 7 (via Vitest, Storybook, etc.) this produced a hard ERESOLVE error requiring npm install --force. SvelteKit consumers always have @sveltejs/kit installed as the framework, so the flags/sveltekit entrypoint continues to resolve it from their own tree.