openSUSE Backports SLE-15-SP3: SU-2021:1069-1 Moderate Icinga2 Update

This update for icinga2 fixes the following issues:

Update to 2.12.4

* Bugfixes

- Fix a crash when notification objects are deleted using the API #8782

- Fix crashes that might occur during downtime scheduling if host or

downtime objects are deleted using the API #8785

- Fix an issue where notifications may incorrectly be skipped after a

downtime ends #8775

- Don't send reminder notification if the notification is still

suppressed by a time period #8808

- Fix an issue where attempting to create a duplicate object using the

API might result in the original object being deleted #8787

- IDO: prioritize program status updates #8809

- Improve exceptions handling, including a fix for an uncaught

exception on Windows #8777

- Retry file rename operations on Windows to avoid intermittent

locking issues #8771

* Enhancements

- Support Boost 1.74 (Ubuntu...