Support React 19

[dborysov]

Some packages don't support React 19:

https://github.com/atlassian/pragmatic-drag-and-drop/blob/main/packages/flourish/package.json#L26
https://github.com/atlassian/pragmatic-drag-and-drop/blob/main/packages/react-accessibility/package.json#L31
https://github.com/atlassian/pragmatic-drag-and-drop/blob/main/packages/react-beautiful-dnd-autoscroll/package.json#L31
https://github.com/atlassian/pragmatic-drag-and-drop/blob/main/packages/react-beautiful-dnd-migration/package.json#L31-L32
https://github.com/atlassian/pragmatic-drag-and-drop/blob/main/packages/react-drop-indicator/package.json#L24

[JackLicc]

I'm also experiencing a bug which needs to upgrade to React 19 to address, meanwhile, I'm using atlassian/pragmatic-drag-and-drop which does not support React 19 at the moment. Please give some love!