Security advisory for luks2 upgrade

boyskarequested to merge
19615-security-advisory into stable

The security advisory is ready! It's MASSIVE: twice as big as our biggest news until now.

I'd like @segfault to have a look at the technicalities.

This branch also includes the doc upgrade for #7049 (closed) and a bunch of other stuff that are not worth for segfault to review. You can jump directly to reading the rendered HTML.

Edited by sajolida

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