config: users: avoid overriding PAM config
The goal here is to avoid overriding PAM modules as is currently done https://gitlab.cri.epita.fr/cri/infrastructure/nixpie/-/blob/00a7c07656939eb28f6681dca9954ad7f7861d0e/modules/config/users-groups.nix#L80. To do this, we need an upstream PR to be merged https://github.com/NixOS/nixpkgs/pull/105319