fix: Handle dynamic values in a11y-autocomplete-valid

[dummdidumm]

Fixes #8562
Fixes #8565

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• Prefix your PR title with feat:, fix:, chore:, or docs:.
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with npm test and lint the project with npm run lint

[vercel]

@dummdidumm is attempting to deploy a commit to the Svelte Team on Vercel.

A member of the Team first needs to authorize it.