[Debian-rtc-admin] Upgrade prosody and prosody-modules to buster-backports versions on vogler

[Peter Palfrader]

On Sun, 31 Jan 2021, Martin wrote:

> please upgrade prosody and prosody-modules on vogler to the
> buster-backports versions instead of the stable versions.
> 
> There are many bug fixes and improvements from prosody 0.11.2 to
> 0.11.7 and in the > 1.5 years of development in the
> prosody-modules.

[x] done

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