[3.15] gh-152785: Upgrade LLVM to LLVM 21 in GitHub Action jobs (GH-152781)#152968

vstinner merged 1 commit into

python:3.15python/cpython:3.15from

miss-islington:backport-f5b3eef-3.15miss-islington/cpython:backport-f5b3eef-3.15Copy head branch name to clipboard