Add Support for React 19 in Flagsmith React SDK

[FrescoDev]

Description:

Given React 19 is now stable, we'd like to be able to ensure this is supported with flagsmith sdks.

Proposed Solution:

• Update Dependencies: Modify the Flagsmith React SDK's peer dependencies to include React 19.​
  npmjs.com
• Testing: Conduct comprehensive testing to ensure full compatibility with React 19, addressing any issues that arise.​

Acceptance Criteria:

• The Flagsmith React/JS SDK should function seamlessly in applications using React 19.​
• All existing functionality should remain unaffected by the update.​
• Documentation should be updated to reflect React 19 compatibility.​

[kyle-ssg]

Hi @FrescoDev thanks for raising, I believe this should work with React 19 assuming that peer dependency restrictions are ignored. Are you able to confirm this is the case? If so this is simply just a case of us adjusting the versions in package.json.

[FrescoDev]

Hi @FrescoDev thanks for raising, I believe this should work with React 19 assuming that peer dependency restrictions are ignored. Are you able to confirm this is the case? If so this is simply just a case of us adjusting the versions in package.json.

Make sense thanks, I'll see if I can confirm this.