vc_service_request.py: fix create_signature signature

vc_service_request.py

@@ -41,7 +41,7 @@ def prepare_audio(audio: Tuple[int, np.ndarray]) -> np.ndarray:
     return wav
 
 
-def create_signature(api_secret: str) -> str:
+def create_signature() -> str:
     """
     helper function that creates signature,
     required to authentificate the request