Remove audioop-lts from requirements — only needed on Python 3.13+

HF Spaces runs Python 3.10 where audioop is still in stdlib.
audioop-lts requires Python >=3.13 so it causes a build failure.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

requirements.txt

@@ -1,4 +1,3 @@
-audioop-lts
 diffusers>=0.30.0
 transformers>=4.44.0
 accelerate>=0.33.0