Remove empty assets object from wrangler config

[smorimoto]

As of @cloudflare/vite-plugin v0.1.14, the assets field in the Wrangler config is now optional. Ref: https://github.com/cloudflare/workers-sdk/blob/main/packages/vite-plugin-cloudflare/CHANGELOG.md#0114

This PR removes the now redundant empty assets object from the configuration.

Ref: cloudflare/workers-sdk#8545

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Latest commit: ed38459

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[remix-cla-bot]

Hi @smorimoto,

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[smorimoto]

We've been using this change in production for about a week now and it works fine.

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[smorimoto]

I bumped the packages from cloudflare/workers-sdk in this PR to sync with the vite plugin release, but you can revert it if you like. It was done to reduce transitive dependency diffs.