fix: update health test to mock httpx.Client.request

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: FrancescoSaverioZuppichini

tests/test_client.py

@@ -442,7 +442,7 @@ def test_credits(self):
 
     def test_health(self):
         body = {"status": "ok", "uptime": 12345}
-        with patch.object(httpx, "request", return_value=mock_response(body)):
+        with patch.object(httpx.Client, "request", return_value=mock_response(body)):
             sgai = ScrapeGraphAI(api_key=API_KEY)
             res = sgai.health()