Hello,
my Homeassistant Supervisor installation is now supported!!! Iám happy now!
echo "extraargs=apparmor=1 security=apparmor" >> /boot/dietpiEnv.txt
sed -i -e "1 s/$/ systemd.unified_cgroup_hierarchy=0/" /boot/dietpiEnv.txt
update-initramfs -u
reboot
df -aT | grep cgroup
Good luck! Greatings from Germany!