[clang-tools-extra] Fix false positive in bugprone-throw-keyword-missing (PR #115138)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

Not sure how to re-run the failed jobs, maybe the force-push broke them. Will open a new PR, sorry for the trouble!

https://github.com/llvm/llvm-project/pull/115138