duosec: use root uid as sshd uid has been retired (#33597)
* fix: use root uid as sshd uid has been retired
fixes https://github.com/NixOS/nixpkgs/issues/10088
related PR (abandoned) at https://github.com/NixOS/nixpkgs/pull/15391
* must use "sshd" user otherwise duosec does not work in multi user mode
see https://github.com/duosecurity/duo_unix/issues/89#issuecomment-272062632
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