[llvm] [Github] Allow CI to run different Python version tests at once (PR #102455)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. I'm assuming you've tested this?

Thanks for fixing this. This has been on my todo list for quite a while. 😅 

https://github.com/llvm/llvm-project/pull/102455