net-mgmt/icinga2: Update to 2-13.2

changelog:
-Prefix command_id with command type
-Decouple environment from Icinga 2 Environment constant
-Make icinga:history:stream:*#event_id deterministic
-Add downtime.duration & service_state.host_id to Redis
-Sync checkables along with their states first
-Flush both buffered states and state checksums on initial dump
-Introduce icinga:history:stream:downtime#scheduled_by
-Actually write parent to parent_id of zones
-Set value in milliseconds for program_start in stats/heartbeat
-Clean up vanished objects from icinga:checksum:*:state
-Remove usernotification history stream
-Write IDs of notified users into notification history stream
-Make CheckResult#scheduling_source available to Icinga DB
-Stream runtime state updates only to icinga:runtime:state
-Publish Redis schema version via XADD icinga:schema
-Don't include checkable types in history IDs
-Remove unused Redis key 'icinga:zone:parent'

Sponsored by: Netzkommune GmbH