Core checks that the init hook is complete before trying to use the g…

…lobal $wp_locale value in wp_default_packages_inline_scripts, which is where the date settings are set for inline JS. This change backports that from Core. (#58406)

lib/compat/wordpress-6.4/script-loader.php

@@ -17,7 +17,7 @@
  * @param WP_Scripts $scripts WP_Scripts object.
  */
 function gutenberg_update_wp_date_settings( $scripts ) {
-	if ( $scripts->query( 'wp-date', 'registered' ) ) {
+	if ( did_action( 'init' ) && $scripts->query( 'wp-date', 'registered' ) ) {
 		global $wp_locale;
 		// Calculate the timezone abbr (EDT, PST) if possible.
 		$timezone_string = get_option( 'timezone_string', 'UTC' );