[BUG]: Error is reported using vfox install python@3.13.7

Version
vfox version 0.6.10
OS
WSL2

Describe the bug
❯ vfox install python@3.13.7
Preinstalling python@3.13.7...
Cloning into '/home/liucf/.version-fox/cache/python/v-3.13.7/pyenv'...
remote: Enumerating objects: 1433, done.
remote: Counting objects: 100% (1433/1433), done.
remote: Compressing objects: 100% (721/721), done.
remote: Total 1433 (delta 898), reused 901 (delta 579), pack-reused 0 (from 0)
Receiving objects: 100% (1433/1433), 1.16 MiB | 6.42 MiB/s, done.
Resolving deltas: 100% (898/898), done.
Building python ...
Downloading Python-3.13.7.tar.xz...
-> https://www.python.org/ftp/python/3.13.7/Python-3.13.7.tar.xz
Installing Python-3.13.7...

BUILD FAILED (Ubuntu 24.04 using python-build 2.6.8)

Inspect or clean up the working tree at /tmp/python-build.20251001233817.91654
Results logged to /tmp/python-build.20251001233817.91654.log

Last 10 log lines:
File "/tmp/python-build.20251001233817.91654/Python-3.13.7/Lib/ensurepip/init.py", line 172, in _bootstrap
return _run_pip([*args, "pip"], [os.fsdecode(tmp_wheel_path)])
File "/tmp/python-build.20251001233817.91654/Python-3.13.7/Lib/ensurepip/init.py", line 87, in _run_pip
return subprocess.run(cmd, check=True).returncode
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/tmp/python-build.20251001233817.91654/Python-3.13.7/Lib/subprocess.py", line 577, in run
raise CalledProcessError(retcode, process.args,
output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['/tmp/python-build.20251001233817.91654/Python-3.13.7/python', '-W', 'ignore::DeprecationWarning', '-c', '\nimport runpy\nimport sys\nsys.path = ['/tmp/tmpbepr0b3t/pip-25.2-py3-none-any.whl'] + sys.path\nsys.argv[1:] = ['install', '--no-cache-dir', '--no-index', '--find-links', '/tmp/tmpbepr0b3t', '--root', '/', '--upgrade', 'pip']\nrunpy.run_module("pip", run_name="main", alter_sys=True)\n']' returned non-zero exit status 1.
make: *** [Makefile:2255: install] Error 1
plugin [PostInstall] method error: /home/liucf/.version-fox/plugin/python/lib/util.lua:234: python build failed
stack traceback:
[G]: in function 'error'
/home/liucf/.version-fox/plugin/python/lib/util.lua:234: in main chunk
(tailcall): ?
[G]: ?
failed to install python

Start by reproducing vfox install python@3.13.7 on WSL2 with vfox 0.6.10, then inspect the Python build log and the post-install path at plugin/python/lib/util.lua:234. Determine why the Python build fails during ensurepip and verify that the installation completes without reporting a plugin error.