Coding Standards: Pass an empty string instead of `null` as the `$replacement` parameter to `_deprecated_file()`.

Follow-up to [48327].

See #50767.
Built from https://develop.svn.wordpress.org/trunk@49564


git-svn-id: http://core.svn.wordpress.org/trunk@49302 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-json.php

@@ -1,5 +1,5 @@
 <?php
-_deprecated_file( basename( __FILE__ ), '5.3.0', null, 'The PHP native JSON extension is now a requirement.' );
+_deprecated_file( basename( __FILE__ ), '5.3.0', '', 'The PHP native JSON extension is now a requirement.' );
 
 if ( ! class_exists( 'Services_JSON' ) ) :
 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

wp-includes/registration-functions.php

@@ -6,4 +6,4 @@
  * @deprecated 2.1.0
  */
 
-_deprecated_file( basename( __FILE__ ), '2.1.0', null, __( 'This file no longer needs to be included.' ) );
+_deprecated_file( basename( __FILE__ ), '2.1.0', '', __( 'This file no longer needs to be included.' ) );

wp-includes/registration.php

@@ -6,4 +6,4 @@
  * @deprecated 3.1.0
  */
 
-_deprecated_file( basename( __FILE__ ), '3.1.0', null, __( 'This file no longer needs to be included.' ) );
+_deprecated_file( basename( __FILE__ ), '3.1.0', '', __( 'This file no longer needs to be included.' ) );

wp-includes/spl-autoload-compat.php

@@ -11,4 +11,4 @@
  * @access private
  */
 
-_deprecated_file( basename( __FILE__ ), '5.3.0', null, 'SPL can no longer be disabled as of PHP 5.3.' );
+_deprecated_file( basename( __FILE__ ), '5.3.0', '', 'SPL can no longer be disabled as of PHP 5.3.' );

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-beta3-49563';
+$wp_version = '5.6-beta3-49564';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.