chore(deps-dev): bump the svelte group with 2 updates

Bumps the svelte group with 2 updates: [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte) and [svelte-preprocess](https://github.com/sveltejs/svelte-preprocess).


Updates `svelte` from 4.2.14 to 4.2.15
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/svelte@4.2.15/packages/svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/commits/svelte@4.2.15/packages/svelte)

Updates `svelte-preprocess` from 5.1.3 to 5.1.4
- [Changelog](https://github.com/sveltejs/svelte-preprocess/blob/main/CHANGELOG.md)
- [Commits](sveltejs/svelte-preprocess@v5.1.3...v5.1.4)

---
updated-dependencies:
- dependency-name: svelte
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: svelte
- dependency-name: svelte-preprocess
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: svelte
...

Signed-off-by: dependabot[bot] <support@github.com>