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Antoine Pitrou authored and GitHub committed effd5af9c76
GH-41147: [CI][C++] Use newer LLVM on Ubuntu 24.04 (#41150) ### What changes are included in this PR? Use LLVM 15 on Ubuntu 24.04, as LLVM 14 packages seem not always available. ### Are these changes tested? Yes, on CI. ### Are there any user-facing changes? No. * GitHub Issue: #41147 Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Antoine Pitrou <antoine@python.org>