uv python pin --global fails when uv directory does not exists

[samypr100]

Summary

When running uv python pin --global introduced in #12115, it can fail if the uv directory does not exists already.

Linux

$ uv python pin --global 3.13
error: failed to write to file `$HOME/.config/uv/.python-version`: No such file or directory (os error 2)

Windows

> uv python pin --global 3.13
error: failed to write to file `%APPDATA%\Roaming\uv\.python-version`: The system cannot find the path specified. (os error 3)

Platform

Windows, Ubuntu

Version

0.6.7 debug build

Python version

3.13.2

[charliermarsh]

Nice, thanks. (Do you wanna take a look at this?)