fix: update namespace case in PHP SDK tests to match class definition (#733)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Max Prilutskiy <maks.prilutskiy@gmail.com>

Author: devin-ai-integration[bot]

php/sdk/tests/LingoDotDevEngineTest.php

@@ -15,7 +15,7 @@
 use GuzzleHttp\Handler\MockHandler;
 use GuzzleHttp\HandlerStack;
 use GuzzleHttp\Psr7\Response;
-use Lingodotdev\Sdk\LingoDotDevEngine;
+use LingoDotDev\Sdk\LingoDotDevEngine;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;