Compatibility with Next.js 15 and React 19

[catchergeese]

Describe the bug
@contentful/live-preview throws an error in Next.js 15 (RC) and React 19 (RC).

To Reproduce
Steps to reproduce the behavior:

1. Setup project with Next.js version 15 with React 19
2. Follow @contentful/live-preview docs for Next.js integration
3. Run npm run dev to run dev server
4. See error TypeError: Cannot read properties of undefined (reading 'ReactCurrentDispatcher')

Expected behavior
It works.

Context (please complete the following information):

• Live preview SDK version number: 4.2.3

Additional context
@contentful/live-preview limits React's version to 18.
I built the package locally after removing this restriction and the error is gone (but I didn't test it in-and-out).

[KlotzJesse]

Can be fixed by correctly stop bundeling react into the packages, by changing the external option in vite.config to:
external: ["react", /^react\/.*/, "react-dom", /react-dom\/.*/],

[YvesRijckaert]

Issue should be fixed with the newest version: 4.5.17

[YvesRijckaert]

Reopening as there seemed to have been some issues with older versions of Next / React with this change 😓

[YvesRijckaert]

Fixed with latest release 🙏