[debian-mysql] Bug#990708: Bug#990708: mariadb-server-10.5: upgrade problems due to galera-3 -> galera-4 switch

[Otto Kekäläinen]

Thanks Andreas for testing potential changes!

If you file them as MRs at
https://salsa.debian.org/mariadb-team/galera-4 and
https://salsa.debian.org/mariadb-team/mariadb-10.5 you'll get the
additional CI testing run on top of the for free for extra validation.
There is a mariadb-10.5 Bullseye update pending already, so this is
excellent time to put in more changes as long as they are justified
(these are).

We also plan to make a mariadb-10.3 stable update to Buster, so
putting a critical fix is also an option.