[clang] Step down as clang-format maintainer (PR #187910)

[Björn Schäpers via cfe-commits]

HazardyKnusperkeks wrote:

I'm reluctant to accept, because I don't think I can commit to the time.

May I ask why are you stepping down? (You can answer me in private, if you like.) And will you still be present for reviews?

https://github.com/llvm/llvm-project/pull/187910