Add support for React 19

[kirkeaton]

Can the peer dependency for React be expanded to included v19? The version of Apollo will likely need to be updated as well to at least the first version that supports React 19 which I believe is v3.12.2.

[danReynolds]

Thanks for reaching out! I'm up for doing this although 3.12 introduces some notable breaking changes that will require a good amount of refactoring. I can't guarantee getting to this soon without community help.