Remove extra GenerateContentConfig class

Author: holtskinner

genai/text_generation/textgen_with_gcs_audio.py

@@ -16,7 +16,7 @@
 def generate_content() -> str:
     # [START googlegenaisdk_textgen_with_gcs_audio]
     from google import genai
-    from google.genai.types import GenerateContentConfig, HttpOptions, Part
+    from google.genai.types import HttpOptions, Part
 
     client = genai.Client(http_options=HttpOptions(api_version="v1"))
     prompt = """