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

[Craig Hesling via llvm-commits]

linux4life798 wrote:

Yes, the previous run for this PR was https://github.com/llvm/llvm-project/actions/runs/7522828209/job/20475369720. I believe security policy disallows it from running the newly added python 3.7 variant, but the full run can be seen in my fork https://github.com/linux4life798/llvm-project/actions/runs/7522828512.

The only delta from those runs was removing the README.txt change.

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