llvm@14, llvm@15: test with py3.12

[chenrui333]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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seeing in #203215

==> /home/linuxbrew/.linuxbrew/Cellar/llvm@15/15.0.7/bin/clang-format -style=google clangformattest.c
==> python3 -c from clang import cindex
cindex.Config().get_cindex_library()
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    from clang import cindex
ModuleNotFoundError: No module named 'clang'

[carlocab]

Re-running as syntax-only to avoid requiring the self-hosted Linux runner. All macOS runners are green.