fix: type error during build

[vicb]

Fix this error with 1.8.1:

TypeError: Cannot read properties of undefined (reading 'default')
    at get #hasAutomaticCachePurging (file:///private/var/folders/hv/nckx8r6d7px_xx1kcb4vg0pm0000gn/T/open-next-tmpv3ohFm/open-next.config.mjs:482:55)
    at new RegionalCache (file:///private/var/folders/hv/nckx8r6d7px_xx1kcb4vg0pm0000gn/T/open-next-tmpv3ohFm/open-next.config.mjs:473:89)
    at withRegionalCache (file:///private/var/folders/hv/nckx8r6d7px_xx1kcb4vg0pm0000gn/T/open-next-tmpv3ohFm/open-next.config.mjs:569:10)
    at file:///private/var/folders/hv/nckx8r6d7px_xx1kcb4vg0pm0000gn/T/open-next-tmpv3ohFm/open-next.config.mjs:588:21
    at ModuleJob.run (node:internal/modules/esm/module_job:274:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:644:26)
    [...]

[changeset-bot]

🦋 Changeset detected

Latest commit: 3ba0912

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

This PR includes changesets to release 1 package

Name	Type
@opennextjs/cloudflare	Patch

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commit: 3ba0912

[vicb]

Thanks for the reviews!