[CI] Set explicit uv version in gh-actions and send authenticated requests to reduce flakiness

[ParagEkbote]

Description

I reviewed a couple of CI runs failing due to rate limits and gh-actions not being to find the uv version. I've updated the gh-action as it has been described in the workflow repo and pinned to a min. version in the workflow. Could you please review?

cc: @johannaSommer

https://github.com/PrunaAI/pruna/actions/runs/20339074867/job/58433124103
https://github.com/PrunaAI/pruna/actions/runs/20340058276/job/58436617832

Related Issue

Fixes #(issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes