Update dependency @sveltejs/adapter-cloudflare to v1.0.0-next.31

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@sveltejs/adapter-cloudflare (source)	1.0.0-next.30 -> 1.0.0-next.31

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Release Notes

sveltejs/kit

### [`v1.0.0-next.31`](https://togithub.com/sveltejs/kit/blob/HEAD/packages/adapter-cloudflare/CHANGELOG.md#​100-next31) [Compare Source](https://togithub.com/sveltejs/kit/compare/@sveltejs/adapter-cloudflare@1.0.0-next.30...@sveltejs/adapter-cloudflare@1.0.0-next.31) ##### Patch Changes - Initialise `env` ([#​5663](https://togithub.com/sveltejs/kit/pull/5663))

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