[llvm] [Nomination] Add additional Apple representative to the Security Group (PR #118571)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

> > @jroelofs For future reference, Paul Robinson (pogo59) is no longer involved.
> 
> wasn't quite sure _how_ retired he was ;)

Well, I'm not on the security group list anymore!

https://github.com/llvm/llvm-project/pull/118571