Update gladia.py (#1317)

* Update gladia.py

According to gladia docs 
https://docs.gladia.io/api-reference/v2/live/init
speech threshould value close to 1 enables gladia to better isolate speeech from noise.

src/pipecat/services/gladia.py

@@ -136,7 +136,7 @@ class GladiaSTTService(STTService):
         maximum_duration_without_endpointing: Optional[int] = 10
         audio_enhancer: Optional[bool] = None
         words_accurate_timestamps: Optional[bool] = None
-
+        speech_threshold: Optional[float] = .99
     def __init__(
         self,
         *,
@@ -144,11 +144,10 @@ class GladiaSTTService(STTService):
         url: str = "https://api.gladia.io/v2/live",
         confidence: float = 0.5,
         sample_rate: Optional[int] = None,
-        params: InputParams = InputParams(),
+        params: InputParams = InputParams(),        
         **kwargs,
     ):
         super().__init__(sample_rate=sample_rate, **kwargs)
-
         self._api_key = api_key
         self._url = url
         self._settings = {
@@ -166,6 +165,7 @@ class GladiaSTTService(STTService):
             "maximum_duration_without_endpointing": params.maximum_duration_without_endpointing,
             "pre_processing": {
                 "audio_enhancer": params.audio_enhancer,
+                "speech_threshold": params.speech_threshold,
             },
             "realtime_processing": {
                 "words_accurate_timestamps": params.words_accurate_timestamps,