release 5.6.0

requested review from @vcunat

assigned to @amrazek

• ./NEWS OK
• ./AUTHORS could be fixed: https://gitlab.nic.cz/knot/knot-resolver/-/jobs/848311 (but no need to rerun CIs after that, perhaps except this single job)
• pytests are an issue with tests; I have a fix that works atop latest changes, but I don't think release needs to wait: https://gitlab.nic.cz/knot/knot-resolver/-/jobs/848303

added 1 commit

• 959fce5a - AUTHORS: .mailmap update

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added 1 commit

• 775d5ea7 - ci: allow failure for bad OBS distrotest jobs

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merged

mentioned in commit 2425110c