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

[via llvm-commits]

nawrinsu wrote:

@nikic I tried to add reviewers but it didn't let me add. Also, I wasn't able to add any comment in either of the PRs. The PR didn't show that it needed approval. I apologize for the confusion.

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