prosody: update to 0.12.4.

[AnInternetTroll]

• New package: lua-unbound-1.0.0
• prosody: add lua51-unbound as a dependency

Testing the changes

• I tested the changes in this PR: YES

New package

• This new package conforms to the package requirements: 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

Crossbuilt from x86_64-glibc and tested on aarch64-musl

Fixes the following warning that shows up when using prosodyctl (any
command):

**************************
Prosody was unable to find lua-unbound
This package can be obtained in the following ways:

  Debian/Ubuntu | sudo apt install lua-unbound
       luarocks | luarocks install luaunbound
         Source | https://www.zash.se/luaunbound.html

Old DNS resolver library will be used
More help can be found on our website, at https://prosody.im/doc/depends
**************************

Fixes the following deprecation as well:

Option	Default	Notes
daemonize	true	Whether to daemonize Prosody or not. DEPRECATED since 0.12, use command line flags -D or -F instead.

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