python3Packages.nose2: 0.9.1 -> 0.9.2 and fix build for ZHF

See inline comment; this is currently broken and not going to continue working
on python2 without significant effort, so mark it python >= 3.6 only.

https://hydra.nixos.org/build/114680648
https://hydra.nixos.org/build/115518949

CC @NixOS/nixos-release-managers

ZHF: #80379