icinga2: check_bird_ospf should us Python3 of course

Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>

icinga2/plugins/check_bird_ospf

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 #
 # Check state of OSPF sessions in Bird Internet Routing Daemon
 #