chore(astro-check): remove unused fast-glob dep

[bluwy]

Changes

I don't think it matters in practice since fast-glob is also used by astro and language-server, but this helps keep the exact deps used concise.

Testing

existing tests should pass

Docs

n/a

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[Princesseuh]

The fast-glob usage in the language-server is wrong anyway, it'll have to get removed eventually. Thank you!