JSX transform incompatible with React 19

[pzaczkiewicz-athenahealth]

Describe the bug

According to React 19 documentation, React.createElement is not going to be supported anymore. React-datepicker@7.3.0 is still transforming its jsx using React.createElement instead of import { jsx } from 'react/jsx-runtime';

To be fair, React 19 is not out of canary status yet, but libraries should adapt prior to React 19 coming out of beta.

To Reproduce

I have not run the React 19 canary with react-datepicker yet. Going off of documentation, and react-datepicker build artefacts.

[hamidrezahanafi]

@pzaczkiewicz-athenahealth React-datepicker 7.3 is not React 19 compatible. My PR should fix this #4979
I don't also see anywhere athat createElement is going to be deprecated https://react.dev/reference/react/createElement

[pzaczkiewicz-athenahealth]

Sorry, I meant to link the React documentation in my original post: https://react.dev/blog/2024/04/25/react-19-upgrade-guide#installing.

What's confusing, is the React 19 canary doesn't appear to have the console.warn described in this documentation. Maybe React.createElement isn't going away with React 19, but the writing is on the wall that it will be deleted eventually.