[Bug]: Support for React version 19

[wrightdw]

Guidelines

• I agree to follow this project's Contributing Guidelines.

Description

Could you possibly upgrade shiny.react to support React version 19?

Problem

I am using a React component in a Shiny app that has been recently upgraded to use React version 19 and it no longer works with shiny.react

Proposed Solution

Provide support for React version 19

Alternatives Considered

No