Release 2.11.11-1

See merge request !16

Note: The release builds for this security update were prepared in a private
fork before publishing the release and were uploaded from there:
https://git.icinga.com/packaging/icinga-2-security-releases-2.13.1-2.12.6-2.11.11/deb-icinga2

Release 2.11.10-1

See merge request !14

Note: The release builds for this security update were prepared in a private
fork before publishing the release and were uploaded from there:
https://git.icinga.com/packaging/icinga2-2.12.5-2.11.10/raspbian-icinga2

Henrik Triem authored May 11, 2020 and Noah Hilverling committed Jun 18, 2020

Ubuntu 20.04 LTS

This is mainly for Ubuntu bionic, but a general dependency approach.