Changed the variable to virtualfilesystem from vendor

Closes #3275075 Made changes in the variablename

automatic_updates_extensions/src/Validator/UpdateReleaseValidator.php

+<?php
+
+namespace Drupal\automatic_updates_extensions\Validator;
+
+use Drupal\automatic_updates\ProjectInfo;
+use Drupal\automatic_updates_extensions\ExtensionUpdater;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\package_manager\Event\PreCreateEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Validates that updated projects are secure and supported.
+ */
+class UpdateReleaseValidator implements EventSubscriberInterface {
+
+  use StringTranslationTrait;
+
+  /**
+   * Checks that the update projects are secure and supported.
+   *
+   * @param \Drupal\package_manager\Event\PreCreateEvent $event
+   *   The event object.
+   */
+  public function checkRelease(PreCreateEvent $event): void {
+    $stage = $event->getStage();
+    // This check only works with Automatic Updates Extensions.
+    if (!$stage instanceof ExtensionUpdater) {
+      return;
+    }
+
+    $all_versions = $stage->getPackageVersions();
+    $messages = [];
+    foreach (['production', 'dev'] as $package_type) {
+      foreach ($all_versions[$package_type] as $package_name => $version) {
+        $package_parts = explode('/', $package_name);
+        $project_name = $package_parts[1];
+        // If the version isn't in the list of installable releases, then it
+        // isn't secure and supported and the user should receive an error.
+        $releases = (new ProjectInfo($project_name))->getInstallableReleases();
+        if (empty($releases) || !array_key_exists($version, $releases)) {
+          $messages[] = $this->t('Project @project_name to version @version', [
+            '@project_name' => $project_name,
+            '@version' => $version,
+          ]);
+        }
+      }
+    }
+    if ($messages) {
+      $summary = $this->formatPlural(
+        count($messages),
+        'Cannot update because the following project version is not in the list of installable releases.',
+        'Cannot update because the following project versions are not in the list of installable releases.'
+      );
+      $event->addError($messages, $summary);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    return [
+      PreCreateEvent::class => 'checkRelease',
+    ];
+  }
+
+}