fix: install only torch/torchvision from jetson index

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

backend/python/chatterbox/requirements-l4t12-after.txt

@@ -0,0 +1,4 @@
+transformers
+numpy>=1.24.0,<1.26.0
+chatterbox-tts@git+https://git@github.com/mudler/chatterbox.git@faster
+accelerate

backend/python/chatterbox/requirements-l4t12.txt

@@ -1,7 +1,3 @@
 --extra-index-url https://pypi.jetson-ai-lab.io/jp6/cu126/
 torch
 torchaudio
-transformers
-numpy>=1.24.0,<1.26.0
-chatterbox-tts@git+https://git@github.com/mudler/chatterbox.git@faster
-accelerate