fix: ruff

Author: k11kirky

posthog/ai/gemini/gemini.py

@@ -65,7 +65,7 @@ def __init__(
             self._ph_client = cast(PostHogClient, posthog.default_client)
         else:
             self._ph_client = posthog_client
-        
+
         if self._ph_client is None:
             raise ValueError("posthog_client is required for PostHog tracking")