Change default encoding to pcm_16000

Author: markbackman

src/pipecat/services/gradium/stt.py

@@ -117,7 +117,7 @@ def __init__(
         *,
         api_key: str,
         api_endpoint_base_url: str = "wss://eu.api.gradium.ai/api/speech/asr",
-        encoding: str = "pcm",
+        encoding: str = "pcm_16000",
         params: Optional[InputParams] = None,
         json_config: Optional[str] = None,
         settings: Optional[Settings] = None,