Issue #3246673: Move PendingUpdatesValidator into Package Manager

package_manager/tests/src/Kernel/PendingUpdatesValidatorTest.php

@@ -63,7 +63,7 @@ class PendingUpdatesValidatorTest extends KernelTestBase {
    * Tests that an error is raised if there are pending post-updates.
    */
   public function testPendingPostUpdate(): void {
-    require __DIR__ . '/../../../fixtures/post_update.php';
+    require __DIR__ . '/../../fixtures/post_update.php';
 
     $result = ValidationResult::createError([
       'Some modules have database schema updates to install. You should run the <a href="/update.php">database update script</a> immediately.',