MSP-11359
The dependency on `metasploit-concern` should not have been in the db
group as `Metasploit::Concern.run` is called for
`Msf::Exploit:Remote::HttpServer`, which works without the db group
installed. This is a fix for a bug from #3781.
This has been a long time coming! Kiwi has been broken for a while and
this updated fixes that problem.
Details of the binaries build date/commits are in the gemspec in the
main meterpreter_bins repo.