Update Clang Maintainers (#168271)
I've left Sonar by the end of October. For my upcoming contributions,
I'll simply use my personal (this) account.
I'll remain a Clang Static Analyser maintainer, but I'll likely spend
less time on that part as in my new job this falls out of my key
responsibilities.
From now on, I'm part of the Apple org, but for accessibility, I'll keep
using my personal email address for open-source contributions and for
the build bots.
