Ubuntu FOCAL, APT doesn't get 8.5 version

Hello,
On ubuntu focal with source configured as below :

cat /etc/apt/sources.list.d/grafana.list deb https://packages.grafana.com/enterprise/deb stable main

apt-update doesn’t show 8.5xx version.
Last version :

Version 8.4.7 (commit: 23bf3ef043, branch: HEAD)

Why APT doesn’t provide 8.5xxx version ?

Thanks .