Import new upstream version 10.11.4 to Debian

See latest commit (from 280369f0..HEAD) for details.

Testing

Salsa-CI at https://salsa.debian.org/otto/mariadb-server/-/pipelines/535537 fully passed, as did test builds on multiple architectures at https://launchpad.net/~mysql-ubuntu/+archive/ubuntu/mariadb-10.11/+builds?build_text=&build_state=all