Bump vitest to v3 beta

[bluwy]

Changes

fix #12662

While it's still in beta, I think it's probably the best middleground to make the vitest template work ootb as its the main supported version that works with Vite 6.

Also this fixes the CI fail in main for the vitest example typecheck.

Testing

CI should pass. Also ran the test in with-vitest manually and worked.

Docs

n/a

[changeset-bot]

⚠️ No Changeset found

Latest commit: b67bcaa

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[codspeed-hq]

CodSpeed Performance Report

Merging #12876 will not alter performance

_{Comparing vitest-3 (b67bcaa) with main (7fb2184)}

Summary

✅ 4 untouched benchmarks