Raise version min PHP 7.3.

tests/framework/db/mysql/QueryTest.php

@@ -45,7 +45,6 @@ class QueryTest extends \yiiunit\framework\db\QueryTest
         $this->assertCount(2, $result);
 
         $this->assertNotContains(1, $result);
-        $this->assertContains(2, $result);
-        $this->assertContains(3, $result);
+        $this->assertEquals([2, 3], $result);
     }
 }