fix(syntax): Don't highlight attributes for HTML events that are not string with JS highlighting

[Princesseuh]

Changes

Fixes https://github.com/withastro/language-tools/issues/815

Testing

Added a test

Docs

N/A

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d2a9428517550cbbf16ae8f006e95f143fdf0314

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------ | ----- | | astro-vscode | Patch |

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