[clang-tools-extra] Move Piotr Zegar to the inactive maintainers list (PR #176967)

[via cfe-commits]

EugeneZelenko wrote:

@HerrCai0907 and @5chmidti are not too active last several months. May be @zeyi2  and @localspook should be added instead?

https://github.com/llvm/llvm-project/pull/176967