Goal: Allow zed to locate [`pixi`](https://github.com/prefix-dev/pixi)
environments
Changes:
- Uses a newer release of
[`python-environment-tools`](https://github.com/microsoft/python-environment-tools)
with the new `pet-pixi` create
- Adds `PythonEnvironmentKind::Pixi` as a possible environment kind, to
allow the rest of the code to detect the environment
I tested the changes locally. It found the correct pixi environment and
I was able to run `pytest` through the UI icon.
Release Notes:
- Added detection for pixi-environments
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Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
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