chore(deps): update diffusers dependency to use GitHub repo for l4t (#7369)

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

backend/python/diffusers/requirements-l4t.txt

@@ -1,6 +1,6 @@
 --extra-index-url https://pypi.jetson-ai-lab.io/jp6/cu126/
 torch
-diffusers
+git+https://github.com/huggingface/diffusers
 transformers
 accelerate
 compel
@@ -9,4 +9,4 @@ optimum-quanto
 numpy<2
 sentencepiece
 torchvision
-ftfy
+ftfy