Upgrade Python to 3.12

[omertuc]

Description

llama-stack starting with version v0.2.13 requires Python 3.12 or later.
This commit updates the lightspeed-stack codebase and CI workflows to
support only Python 3.12 and above so we can bump the version to
v0.2.13 later

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement

Related Tickets & Documents

• Related Issue #

MGMT-20959

• Closes #

Checklist before requesting a review

• I have performed a self-review of my code.
• PR has passed all pre-merge test jobs.
  • What these are? How do I run them?
• n/a - If it is a core feature, I have added thorough tests.

Testing

• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.

[tisnik]

it looks ok

[omertuc]

I've failed to reproduce these 3.13 github action failures

locally

Are they normal, or should I get to the bottom of them before merging?

[tisnik]

Probably worth to check https://techoverflow.net/2022/04/16/how-to-fix-python-pillow-pip-install-exception-requireddependencyexception-jpeg/

[tisnik]

Approved, thank you!