Upgrade/Install: Store correct result when bulk updating plugins or themes.

This ensures that when multiple plugins or themes are updated and one succeeds and another fails, the error is reported accordingly.

Previously, both updates would end up treated as a success, due to `$this->result` containing the result of the previous operation and not the current one.

Follow-up to [12097].

Props pwtyler, afragen.
Fixes #53002.
Built from https://develop.svn.wordpress.org/trunk@51528


git-svn-id: http://core.svn.wordpress.org/trunk@51139 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-plugin-upgrader.php

@@ -347,7 +347,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 				)
 			);
 
-			$results[ $plugin ] = $this->result;
+			$results[ $plugin ] = $result;
 
 			// Prevent credentials auth screen from displaying multiple times.
 			if ( false === $result ) {

wp-admin/includes/class-theme-upgrader.php

@@ -448,7 +448,7 @@ class Theme_Upgrader extends WP_Upgrader {
 				)
 			);
 
-			$results[ $theme ] = $this->result;
+			$results[ $theme ] = $result;
 
 			// Prevent credentials auth screen from displaying multiple times.
 			if ( false === $result ) {

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51527';
+$wp_version = '5.9-alpha-51528';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.