Bump svelte and sveld (#116)

Bumps [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte) and [sveld](https://github.com/carbon-design-system/sveld). These dependencies needed to be updated together.

Updates `svelte` from 4.0.0 to 4.2.19
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/svelte@4.2.19/packages/svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/commits/svelte@4.2.19/packages/svelte)

Updates `sveld` from 0.18.1 to 0.20.0
- [Release notes](https://github.com/carbon-design-system/sveld/releases)
- [Changelog](https://github.com/carbon-design-system/sveld/blob/main/CHANGELOG.md)
- [Commits](carbon-design-system/sveld@v0.18.1...v0.20.0)

---
updated-dependencies:
- dependency-name: svelte
  dependency-type: direct:development
- dependency-name: sveld
  dependency-type: direct:development
...

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