Update nixpkgs.

Kernal update, grafana patch release, strace update

nix store diff-closures

VirtualBox-GuestAdditions: 6.1.30-5.10.91 → 6.1.30-5.10.93
cpupower: 5.10.91 → 5.10.93
ena: 2.5.0-5.10.91 → 2.5.0-5.10.93
grafana: 8.3.3 → 8.3.4, -1424.0 KiB
initrd-linux: 5.10.91 → 5.10.93, -18.3 KiB
linux: 5.10.91, 5.10.91-modules → 5.10.93, 5.10.93-modules
mdadm.conf: ε → ∅
nixos-system-monitoring: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-payments: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-storage001: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-storage002: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-storage003: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-storage004: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-storage005: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-storage1: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
nixos-system-storage2: 21.11.335288.3ddd960a3b5 → 21.11.335481.604c44137d9
stage: -19.4 KiB
strace: 5.15 → 5.16
zfs-kernel: 2.1.2-5.10.91 → 2.1.2-5.10.93

There is also a change the nixos ssh module, that disallows putting multiple keys in morph/grid/local/public-keys/users.nix, which impacted my local configuration, but likely doesn't impact others.