Hi! You can see the status of MariaDB at in Debian at https://tracker.debian.org/pkg/mariadb for Bookworm and https://tracker.debian.org/pkg/mariadb-10.5 for Bullseye.
The Bookworm update has already been uploaded, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1104874 The Bullseye one is pending approvals at https://salsa.debian.org/mariadb-team/mariadb-10.5/-/merge_requests/22
