[llvm] [LLVM][Maintainers] Update LLVM maintainers for OpenMP runtime (PR #118521)

[Nikita Popov via llvm-commits]

nikic wrote:

I'm a bit surprised by the merge without approval here. Usually this kind of change needs an approval from the new maintainers, as well as the old one (unless they're no longer reachable/active) -- was this change discussed somewhere other than this PR maybe?

https://github.com/llvm/llvm-project/pull/118521