Allow to work with React 19

[rtconner]

Hello when i try to install this I get this error

npm error Found: react@19.0.0
npm error node_modules/react
npm error   react@"^19.0.0" from the root project
npm error
npm error Could not resolve dependency:
npm error peer react@"^16.8 || ^17 || ^18" from @react-jvectormap/core@1.0.4
npm error node_modules/@react-jvectormap/core
npm error   @react-jvectormap/core@"*" from the root project
npm error
npm error Fix the upstream dependency conflict, or retry

Can you please do the updates to let it work with react 19.

[TD-DO]

@kadoshms I've got time to make a PR if you want?