Merge pull request #5171 from preactjs/JoviDeCroock/compat-react-19-version

Bump reported React version to 19.0.0

Author: JoviDeCroock

compat/src/index.js

@@ -43,7 +43,7 @@ import {
 } from './render';
 import { Suspense, lazy } from './suspense';
 
-const version = '18.3.1'; // trick libraries to think we are react
+const version = '19.0.0'; // trick libraries to think we are react
 
 /**
  * Legacy version of createElement.