React InstantSearch NextJS not compatible with NextJS 15 (stable release as of 10/21): Not handling async request apis

[buyblvd-ryan]

🐛 Current behavior

NextJS 15 became the official release on Monday, but InstantSearch Next doesn't work with the new asynchronous request apis causing several errors. InstantSearchNext.tsx and useInstantSearchRouting.ts both access headers incorrectly. Didn't see any references to Next15 compatibility in any issues or PRs, so wanted to open this up for people in the same boat as me.

🔍 Steps to reproduce

1. Setup NextJS project
2. Use React InstantSearch NextJS
3. Error!

Live reproduction

N/A

💭 Expected behavior

N/A

Package version

react-instantsearch-nextjs 0.3.15

Operating system

All

Browser

All

Code of Conduct

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