Update nvcr.io/nvidia/pytorch Docker tag to v25

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

Author: red-hat-konflux[bot]

sdk/python/kubeflow/trainer/Dockerfile

@@ -1,5 +1,5 @@
 # Use an official Pytorch runtime as a parent image
-FROM nvcr.io/nvidia/pytorch:24.06-py3
+FROM nvcr.io/nvidia/pytorch:25.09-py3
 
 # Set the working directory in the container
 WORKDIR /app