Update NEWS to summarize what is new in MariaDB 10.11 (compared to 10.6)

See commits for details.

Additionally we should propose for https://www.debian.org/releases/bookworm/amd64/release-notes/ch-whats-new.en.html#newdistro to have:

Package	Bullseye	Bookworm
MariaDB	10.6	10.11