This PR was squashed before being merged into the main branch.

Discussion
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Add support for Svelte 5

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes <!-- please update CHANGELOG.md file -->
| Deprecations? | no <!-- please update CHANGELOG.md file -->
| Issues        | Fix #1384 <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

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Commits
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f4fcf4d Fix functional test on PostCSS/Autoprefixer
fa91367 Add support for Svelte 5