Fix reference parameter test to expect array instead of object (#9)

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]

tests/LingoDotDevEngineTest.php

@@ -312,7 +312,7 @@ public function testReferenceParameterHandling()
         $requestBody = json_decode($request->getBody()->getContents(), true);
 
         $this->assertArrayHasKey('reference', $requestBody);
-        $this->assertEquals(new \stdClass(), $requestBody['reference']);
+        $this->assertEquals([], $requestBody['reference']);
 
         $this->assertArrayHasKey('params', $requestBody);
         $this->assertArrayHasKey('locale', $requestBody);