External Libraries: Append a string to react/react-dom versions.

In 6.7, [58775] changed the way `react` and `react-dom` are bundled in Core. This commit resulted in some changes to the built files that are distributed in WordPress even though the actual version of the libraries remained the same.

The result can be a blank white screen when trying to edit a post when those two script files are heavily cached. This adds `-umd` to the end of the version number to properly purge caches until the next update to these libraries occurs.

Props levskipg, get_dave, smerriman, jdnd, juanwp22, seanlanglands, robertstaddon.
Fixes 62422.

git-svn-id: https://develop.svn.wordpress.org/trunk@59536 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -106,8 +106,8 @@ function wp_default_packages_vendor( $scripts ) {
 	);
 
 	$vendor_scripts_versions = array(
-		'react'                       => '18.3.1',
-		'react-dom'                   => '18.3.1',
+		'react'                       => '18.3.1-umd',
+		'react-dom'                   => '18.3.1-umd',
 		'react-jsx-runtime'           => '18.3.1',
 		'regenerator-runtime'         => '0.14.1',
 		'moment'                      => '2.30.1',