chore(language-server): move @volar/typescript as dev dep

[bluwy]

Changes

Lame PR 😅 but @volar/typescript was only used as types so we move it as a dev dep. It's still used transitively by @volar/language-server and @volar/kit, so not removed from the dependency graph

Testing

Manually checked that it's not used in the compiled js or dts files.

Docs

n/a

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Latest commit: 14a1b57

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[Princesseuh]

I'll allow it