Issue #3305316 by Project Update Bot: Automated Drupal 10 compatibility fixes

tests/src/Kernel/PermanentDatabaseBackendTest.php

@@ -17,7 +17,7 @@ class PermanentDatabaseBackendTest extends GenericCacheBackendUnitTestBase {
    *
    * @var array
    */
-  public static $modules = [
+  protected static $modules = [
     'system',
     'pcb',
   ];