Update package.json to support svelte@next

<!-- Thanks for creating this pull request 🤗 Please make sure that the pull request is limited to one type (docs, feature, etc.) and keep it as small as possible. You can open multiple prs instead of opening a huge one. --> <!-- If this pull request closes an issue, please mention the issue number below --> ## 📑 Description <!-- Add a brief description of the pr --> Currently, this package cannot be installed with svelte@next. It works fine, but the dependency restriction is quite strict. I added svelte@next as a dependency to resolve this issue. Current behavior when running `npm install` with svelte@next: ``` Found: svelte@5.0.0-next.165 npm ERR! node_modules/svelte npm ERR! dev svelte@"^5.0.0-next.1" from the root project npm ERR! npm ERR! Could not resolve dependency: npm ERR! peer svelte@"^5.0.0" from svelte-radix@2.0.0-next.1 ``` <!-- You can also choose to add a list of changes and if they have been completed or not by using the markdown to-do list syntax - [ ] Not Completed - [x] Completed --> ## ✅ Checks <!-- Make sure your pr passes the tests and do check the following fields as needed - --> - [x] My pull request adheres to the code style of this project - [x] My code requires changes to the documentation - [x] I have updated the documentation as required - [x] All the tests have passed ## ℹ Additional Information <!-- Any additional information like breaking changes, dependencies added, screenshots, comparisons between new and old behavior, etc. -->