fix(cache): make sure to await the revalidation promise before returning it

[chronark]

_{Huly®: ENG-1805}

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🦋 Changeset detected

Latest commit: 4f38ce68ee503b278090054f6a343772db281695

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

This PR includes changesets to release 3 packages

| Name | Type | | --------------------- | ----- | | @unkey/cache | Patch | | api | Patch | | @unkey/semantic-cache | Patch |

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