Update Python.gitignore (pixi)

[RiseT]

Reasons for making this change

That's what pixi itself currently adds to .gitignore when using "pixi init" (in addition to the already existing line).

Links to documentation supporting these rule changes

https://github.com/prefix-dev/pixi/pull/4108

If this is a new template

Link to application or project’s homepage: TODO

Merge and Approval Steps

• [x] Confirm that you've read the contribution guidelines and ensured your PR aligns
• [x] Ensure CI is passing
• [x] Get a review and Approval from one of the maintainers

[github-actions[bot]]

This PR is stale because there have been no updates in 90 days. It will close after 180 days of inactivity. Leave a comment if you want to keep it open :smile: