Site Health: Replace `wp_get_upload_dir()` with `wp_upload_dir()`.

`wp_get_upload_dir()` returns the theoretical path of the uploads directory. When there was no upload yet the test returns an incorrect result (not writeable) because the directory doesn't exist. Switching to `wp_upload_dir()`, which creates the directory on the fly, ensures a proper test result.

Fixes #47958.
Built from https://develop.svn.wordpress.org/trunk@46228


git-svn-id: http://core.svn.wordpress.org/trunk@46040 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-debug-data.php

@@ -33,7 +33,7 @@ class WP_Debug_Data {
 		global $wpdb;
 
 		// Save few function calls.
-		$upload_dir             = wp_get_upload_dir();
+		$upload_dir             = wp_upload_dir();
 		$permalink_structure    = get_option( 'permalink_structure' );
 		$is_ssl                 = is_ssl();
 		$users_can_register     = get_option( 'users_can_register' );

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46227';
+$wp_version = '5.3-alpha-46228';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.