Bump svelte and @sveltejs/vite-plugin-svelte in /code/src/iris

Bumps [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte) and [@sveltejs/vite-plugin-svelte](https://github.com/sveltejs/vite-plugin-svelte/tree/HEAD/packages/vite-plugin-svelte). These dependencies needed to be updated together.

Updates `svelte` from 4.2.20 to 5.55.1
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/main/packages/svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/commits/svelte@5.55.1/packages/svelte)

Updates `@sveltejs/vite-plugin-svelte` from 3.1.2 to 7.0.0
- [Release notes](https://github.com/sveltejs/vite-plugin-svelte/releases)
- [Changelog](https://github.com/sveltejs/vite-plugin-svelte/blob/main/packages/vite-plugin-svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/vite-plugin-svelte/commits/@sveltejs/vite-plugin-svelte@7.0.0/packages/vite-plugin-svelte)

---
updated-dependencies:
- dependency-name: svelte
  dependency-version: 5.55.1
  dependency-type: direct:development
- dependency-name: "@sveltejs/vite-plugin-svelte"
  dependency-version: 7.0.0
  dependency-type: direct:development
...

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Author: dependabot[bot]