Update requirements.txt

requirements.txt

@@ -4,3 +4,5 @@ optimum>=1.23.0        # makes transformers’ quantizer happy
 auto-gptq>=0.7.0.post0 # wheels available for CUDA 11.8/12.x
 bitsandbytes>=0.43.0   # still useful for 4-bit mat-muls
 accelerate>=0.29.0
+sentencepiece       # tokenizer dependency
+gradio>=4.28