the default hasn't been changed since 2009 this can improve our test performances nixos/tests: remove explicit memorySize <1024 1024MiB is now the default
GNOME Shell 41 made the Eval command we use for NixOS tests internal so in order to be still able to use it, we need to run the shell in an unsafe mode. https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1970 https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1983 Hopefully, the test driver will eventually get better so that we will not need hacks like this forever.
Since GNOME version is now 40, it no longer makes sense to use the old attribute name.