[Workers] fix: update supported vitest version

[Cherry]

Summary

This simply updates the supported vitest version to 2.1.8. The Workers vitest integrations works with 2.0.x - 2.1.x.

Paired with cloudflare/workers-sdk#7384

[hyperlint-ai-deprecated]

2 files reviewed, 1 total issue(s) found.

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Note: We resolved prior Hyperlint review comments because:

We updated our inline suggestion AI.

We do this to avoid keeping outdated or irrelevant comments around. We'll leave a new review with current comments below.

[Cherry]

This is good to merge now, with cloudflare/workers-sdk#7384 landing in https://github.com/cloudflare/workers-sdk/releases/tag/create-cloudflare%402.33.3

[hyperlint-ai-deprecated]

2 files reviewed, 1 total issue(s) found.

[GregBrimble]

Thanks!

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