Code Modernization: Pass correct default value to new DateTime() in wp_default_packages_inline_scripts().

This fixes a "Deprecated: `DateTime::__construct()`: Passing null to parameter #1 (`$datetime`) of type string is deprecated" warning on PHP 8.1.

Follow-up to [49083].

See #53635.

git-svn-id: https://develop.svn.wordpress.org/trunk@51533 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/script-loader.php

@@ -330,7 +330,7 @@ function wp_default_packages_inline_scripts( $scripts ) {
 	$timezone_abbr   = '';
 
 	if ( ! empty( $timezone_string ) ) {
-		$timezone_date = new DateTime( null, new DateTimeZone( $timezone_string ) );
+		$timezone_date = new DateTime( 'now', new DateTimeZone( $timezone_string ) );
 		$timezone_abbr = $timezone_date->format( 'T' );
 	}