gajim: update to 2.3.6 (and update python3-nbxmpp as it is a requirement and developed by Gajim as well)

[chilledfrogs]

Testing the changes

• I tested the changes in this PR: YES

Local build testing

• I built this PR locally for my native architecture, (x86_64-glibc)
• I built this PR locally for these architectures (if supported. mark crossbuilds):
  • aarch64-musl

[chilledfrogs]

Considering the checks worked on my machine, I think some of them depend on a display being open

[lissine0]

Hi @chilledfrogs
This PR is a duplicate of #56999
If you tested the package update and it works well for you, give that PR a 👍 reaction and write a comment saying that you tested the changes.
As far as I can tell, doing so gives the PR more chances of getting merged.

P.S. the checks likely failed because Gajim 2.3.0 added libadwaita as a dependency

[chilledfrogs]

My bad, somehow missed that PR @lissine0, and thanks for the clarifications, added it as a dependency (I did notice it as a part of the major UI rehaul but I forgot to add it to the template, whoops)

[github-actions]

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