[llvm] [GitHub] Add python 3.7 to libclang python test (PR #77219)

[Craig Hesling via llvm-commits]

linux4life798 wrote:

> This is not working correctly. One of the jobs always gets cancelled, because the concurrency_group defined in llvm-project-tests.yml is the same for both jobs since it is keyed on the input projects.

Yep, I saw that. I think the simplest fix is to push the python test matrix into the llvm-project-tests.yml.

https://github.com/llvm/llvm-project/pull/77219