feat(cartesia): add updateOptions (#375)

Author: nbsp

.changeset/tall-crews-tickle.md

@@ -0,0 +1,5 @@
+---
+"@livekit/agents-plugin-cartesia": patch
+---
+
+add updateOptions

plugins/cartesia/src/tts.ts

@@ -61,13 +61,15 @@ export class TTS extends tts.TTS {
     }
   }
 
-  // TODO(nbsp): updateOptions
+  updateOptions(opts: Partial<TTSOptions>) {
+    this.#opts = { ...this.#opts, ...opts };
+  }
 
   synthesize(text: string): tts.ChunkedStream {
     return new ChunkedStream(this, text, this.#opts);
   }
 
-  stream(): tts.SynthesizeStream {
+  stream(): SynthesizeStream {
     return new SynthesizeStream(this, this.#opts);
   }
 }
@@ -144,6 +146,10 @@ export class SynthesizeStream extends tts.SynthesizeStream {
     this.#run();
   }
 
+  updateOptions(opts: Partial<TTSOptions>) {
+    this.#opts = { ...this.#opts, ...opts };
+  }
+
   async #run() {
     const requestId = randomUUID();
     let closing = false;