Update the minimum WP version to 5.9

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: 5.8
+ * Requires at least: 5.9
  * Requires PHP: 5.6
  * Version: 13.6.0-rc.1
  * Author: Gutenberg Team
@@ -26,7 +26,7 @@
 function gutenberg_wordpress_version_notice() {
 	echo '<div class="error"><p>';
 	/* translators: %s: Minimum required version */
-	printf( __( 'Gutenberg requires WordPress %s or later to function properly. Please upgrade WordPress before activating Gutenberg.', 'gutenberg' ), '5.8' );
+	printf( __( 'Gutenberg requires WordPress %s or later to function properly. Please upgrade WordPress before activating Gutenberg.', 'gutenberg' ), '5.9' );
 	echo '</p></div>';
 
 	deactivate_plugins( array( 'gutenberg/gutenberg.php' ) );
@@ -64,7 +64,7 @@ function gutenberg_pre_init() {
 	// Compare against major release versions (X.Y) rather than minor (X.Y.Z)
 	// unless a minor release is the actual minimum requirement. WordPress reports
 	// X.Y for its major releases.
-	if ( version_compare( $version, '5.8', '<' ) ) {
+	if ( version_compare( $version, '5.9', '<' ) ) {
 		add_action( 'admin_notices', 'gutenberg_wordpress_version_notice' );
 		return;
 	}

lib/block-supports/layout.php

@@ -219,7 +219,7 @@ function gutenberg_render_layout_support_flag( $block_content, $block ) {
 		1
 	);
 
-	gutenberg_enqueue_block_support_styles( $style );
+	wp_enqueue_block_support_styles( $style );
 
 	return $content;
 }