[Chapel Merge] Update centos portability to use LLVM 21

Notifications Commits
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Branch: refs/heads/main
Revision: 08ff2140456c7ed155be2f2988c705a5f145a790
Author: benharsh
Link: Update centos portability to use LLVM 21 by benharsh · Pull Request #28748 · chapel-lang/chapel · GitHub
Log Message:
Update centos portability to use LLVM 21 (#28748)

Compare: Comparing 0c650fe6c6191ee1099dd1f5f9823221c2164ace...a423a8a8db779721694e330b43e797da2b437c93 · chapel-lang/chapel · GitHub

Diff:
M util/devel/test/portability/apptainer/current/centos-stream-10/image.def
M util/devel/test/portability/apptainer/current/centos-stream-9/image.def
D util/devel/test/portability/provision-scripts/dnf-llvm20.sh
A util/devel/test/portability/provision-scripts/dnf-llvm21.sh
https://github.com/chapel-lang/chapel/pull/28748.diff