Next.js 15 Support

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Package

I’m not sure

Describe the feature request

Next 15 is stable and seems reasonably low effort to support: https://nextjs.org/blog/next-15 We should wait until after Next.js conf just in case they are holding back some surprises.

Describe the solution you'd like

This seems like the only breaking change we might need to make some changes for: https://nextjs.org/blog/next-15#async-request-apis-breaking-change

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Resolved by #824