Fix deprecation errors in tests

Author: ADmad

tests/test_app/Plugin/OverridePlugin/src/OverridePluginPlugin.php

@@ -0,0 +1,10 @@
+<?php
+declare(strict_types=1);
+
+namespace OverridePlugin;
+
+use Cake\Core\BasePlugin;
+
+class OverridePluginPlugin extends BasePlugin
+{
+}

tests/test_app/Plugin/TestPlugin/src/TestPluginPlugin.php

@@ -0,0 +1,10 @@
+<?php
+declare(strict_types=1);
+
+namespace TestPlugin;
+
+use Cake\Core\BasePlugin;
+
+class TestPluginPlugin extends BasePlugin
+{
+}