[Rime] - Update url for Websockets API

Rime has migrated their Websockets api to the base url `user.rime.ai` along with all other tts endpoints. 

See the [docs](https://docs.rime.ai/api-reference/endpoint/websockets)

`users-ws.rime.ai` is deprecated and will not reflect upgrades to the rime ws api.

src/pipecat/services/rime/tts.py

@@ -74,7 +74,7 @@ class RimeTTSService(AudioContextWordTTSService):
         *,
         api_key: str,
         voice_id: str,
-        url: str = "wss://users-ws.rime.ai/ws2",
+        url: str = "wss://users.rime.ai/ws2",
         model: str = "mistv2",
         sample_rate: Optional[int] = None,
         params: InputParams = InputParams(),