buf: remove aaronjheng from maintainers

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pkgs/by-name/bu/buf/package.nix
··· 90 maintainers = with lib.maintainers; [ 91 jk 92 lrewega 93 - aaronjheng 94 ]; 95 mainProgram = "buf"; 96 };
··· 90 maintainers = with lib.maintainers; [ 91 jk 92 lrewega 93 ]; 94 mainProgram = "buf"; 95 };