Bug#1099515: mariadb-server: Error with INSERT SELECT on NOT NULL columns while having BEFORE UPDATE trigger

[Otto Kekäläinen]

Based on 
https://github.com/MariaDB/server/commit/2d971709a8b96ebd71c4a5d2ca74ee6f72ad0355
this was already in 11.8.1, and thus already fixed in Debian unstable.

Fixes for Bookworm and Bullseye are pending next upload.