Update requirements.txt

requirements.txt

@@ -1,4 +1,4 @@
-gradio>=4.0.0
-pydub>=0.25.1
-numpy>=1.21.0
-ffmpeg-python>=0.2.0
+gradio==6.3.0
+pydub==0.25.1
+numpy>=1.24.0
+ffmpeg-python==0.2.0