fix: update openai tts class

Author: VinciGit00

scrapegraphai/models/openai_tts.py

@@ -21,7 +21,8 @@ class OpenAITextToSpeech:
     def __init__(self, tts_config: dict):
 
         # convert model_name to model
-        self.client = OpenAI(api_key=tts_config.get("api_key"))
+        self.client = OpenAI(api_key=tts_config.get("api_key"), 
+                             base_url=tts_config.get("base_url", None))
         self.model = tts_config.get("model", "tts-1")
         self.voice = tts_config.get("voice", "alloy")