fix(wpmc S2): drop redundant Mockery::close from TestCase teardown

Brain\Monkey\tearDown() already calls Mockery::close internally;
calling it explicitly duplicates the close.

tests/TestCase.php

@@ -4,7 +4,6 @@ declare(strict_types=1);
 namespace WPMultiCity\Tests;
 
 use Brain\Monkey;
-use Mockery;
 use PHPUnit\Framework\TestCase as BaseTestCase;
 
 abstract class TestCase extends BaseTestCase
@@ -18,7 +17,6 @@ abstract class TestCase extends BaseTestCase
     protected function tearDown(): void
     {
         Monkey\tearDown();
-        Mockery::close();
         parent::tearDown();
     }
 }