Bump spaces==0.48.1 -> 0.48.2 to resolve build conflict

HF auto-Dockerfile pins spaces==0.48.2; requirements.txt pinning
0.48.1 was causing pip ResolutionImpossible during image build.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

requirements.txt

@@ -12,7 +12,7 @@ soundfile==0.12.1
 timm==1.0.12
 transformers==4.47.0
 omegaconf
-spaces==0.48.1
+spaces==0.48.2
 gradio==5.25.0
 pydantic==2.8.2
 av