Update PyTorch to 2.7.1; Update Python to 3.12.11

Author: YanWenKun

builder/pak2.txt

@@ -1,6 +1,6 @@
 --index-url https://download.pytorch.org/whl/cu128
 --extra-index-url https://pypi.org/simple
-xformers==0.0.30
-torch==2.7.0
-torchvision==0.22.0
-torchaudio==2.7.0
+xformers==0.0.31.post1
+torch==2.7.1
+torchvision==0.22.1
+torchaudio==2.7.1

builder/stage1.sh

@@ -15,7 +15,7 @@ ls -lahF
 # Download Python Standalone
 cd "$workdir"
 curl -sSL \
-https://github.com/astral-sh/python-build-standalone/releases/download/20250521/cpython-3.12.10+20250521-x86_64-pc-windows-msvc-install_only.tar.gz \
+https://github.com/astral-sh/python-build-standalone/releases/download/20250708/cpython-3.12.11+20250708-x86_64-pc-windows-msvc-install_only.tar.gz \
     -o python.tar.gz
 tar -zxf python.tar.gz
 mv python python_standalone