revert ConnectTest mixed union change

Author: samsonasik

rector.php

@@ -128,6 +128,7 @@
             __DIR__ . '/tests/system/Honeypot/HoneypotTest.php',
             __DIR__ . '/tests/system/Filters/HoneypotTest.php',
             __DIR__ . '/tests/system/Test/TestResponseTest.php',
+            __DIR__ . '/tests/system/Database/Live/ConnectTest.php',
         ],
     ]);
 

tests/system/Database/Live/ConnectTest.php

@@ -16,7 +16,6 @@
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\DatabaseTestTrait;
 use Config\Database;
-use MySQLi;
 
 /**
  * @group DatabaseLive
@@ -27,19 +26,8 @@ final class ConnectTest extends CIUnitTestCase
 {
     use DatabaseTestTrait;
 
-    /**
-     * @var mixed|class-string<MySQLi>[]
-     */
     private $group1;
-
-    /**
-     * @var mixed|string[]
-     */
     private $group2;
-
-    /**
-     * @var mixed|string[]
-     */
     private $tests;
 
     protected function setUp(): void