[fix]Update requirements.txt For fix

Modify the version of Gradio, which does not support the color button when it is lower than version 3.24. On version 3.25, it fixes the issue https://github.com/gradio-app/gradio/issues/3716 and #371 .

修改一下gradio的版本，低于 3.24版本时不支持 color button，3.25则修复了 issue: #371 和 https://github.com/gradio-app/gradio/issues/3716

requirements.txt

@@ -1,4 +1,4 @@
-gradio>=3.23
+gradio>=3.25.0
 requests[socks]
 transformers
 python-markdown-math