Remove wordpress-6.0 specific code.

gutenberg.php

@@ -3,7 +3,7 @@
  * Plugin Name: Gutenberg
  * Plugin URI: https://github.com/WordPress/gutenberg
  * Description: Printing since 1440. This is the development plugin for the new block editor in core.
- * Requires at least: 5.9
+ * Requires at least: 6.0
  * Requires PHP: 5.6
  * Version: 14.7.0-rc.1
  * Author: Gutenberg Team

lib/client-assets.php

@@ -539,6 +539,37 @@ function gutenberg_enqueue_stored_styles( $options = array() ) {
 	}
 }
 
+/**
+ * Registers vendor JavaScript files to be used as dependencies of the editor
+ * and plugins.
+ *
+ * This function is called from a script during the plugin build process, so it
+ * should not call any WordPress PHP functions.
+ *
+ * @since 13.0
+ *
+ * @param WP_Scripts $scripts WP_Scripts instance.
+ */
+function gutenberg_register_vendor_scripts( $scripts ) {
+	$extension = SCRIPT_DEBUG ? '.js' : '.min.js';
+
+	gutenberg_override_script(
+		$scripts,
+		'react',
+		gutenberg_url( 'build/vendors/react' . $extension ),
+		// See https://github.com/pmmmwh/react-refresh-webpack-plugin/blob/main/docs/TROUBLESHOOTING.md#externalising-react.
+		SCRIPT_DEBUG ? array( 'wp-react-refresh-entry', 'wp-polyfill' ) : array( 'wp-polyfill' )
+	);
+	gutenberg_override_script(
+		$scripts,
+		'react-dom',
+		gutenberg_url( 'build/vendors/react-dom' . $extension ),
+		array( 'react' )
+	);
+}
+add_action( 'wp_default_scripts', 'gutenberg_register_vendor_scripts' );
+
+
 /*
  * Always remove the Core action hook while gutenberg_enqueue_stored_styles() exists to avoid styles being printed twice.
  * This is also because gutenberg_enqueue_stored_styles uses the Style Engine's `gutenberg_*` functions and `_Gutenberg` classes,