Update AssemblyAI examples to use u3-rt-pro and improve 55d example

- Update 13d-assemblyai-transcription.py to explicitly use u3-rt-pro model
- Update 55d-update-settings-assemblyai-stt.py to demonstrate keyterms updates instead of language updates
- Add helpful logging to show before/after keyterms boosting effect
- Use difficult names (Xiomara, Saoirse, Krzystof) to demonstrate boosting effectiveness

examples/foundational/13d-assemblyai-transcription.py

@@ -16,6 +16,7 @@ from pipecat.pipeline.task import PipelineTask
 from pipecat.processors.frame_processor import FrameDirection, FrameProcessor
 from pipecat.runner.types import RunnerArguments
 from pipecat.runner.utils import create_transport
+from pipecat.services.assemblyai.models import AssemblyAIConnectionParams
 from pipecat.services.assemblyai.stt import AssemblyAISTTService
 from pipecat.transports.base_transport import BaseTransport, TransportParams
 from pipecat.transports.daily.transport import DailyParams
@@ -49,6 +50,9 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
 
     stt = AssemblyAISTTService(
         api_key=os.getenv("ASSEMBLYAI_API_KEY"),
+        connection_params=AssemblyAIConnectionParams(
+            speech_model="u3-rt-pro",
+        ),
     )
 
     tl = TranscriptionLogger()