Bump Docker image to Bullseye
Since we need OpenJDK 15+ in Briar Desktop, this MR bumps the base Debian image from buster to bullseye.
As discussed in briar-desktop!44 (comment 57092).
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check that it works in briar-android -
check that it works in briar-desktop -
check that it works in briar-mailbox
Edited by Nico