requirements update: specified diffusers tag or branch did not exist anymore

requirements.txt

@@ -1,7 +1,7 @@
 accelerate
-git+https://github.com/huggingface/diffusers.git@flux-pipeline
+diffusers==0.30.1
 invisible_watermark
 torch
 transformers==4.42.4
 xformers
-sentencepiece
+sentencepiece