cinnamon-calendar-server.py: Allow ICal 4.0.

Distros are starting to see the new ical version. For what we use
in the calendar server, there are no additional changes needed.

Fixes #13763

Author: mtwebster

calendar-server/cinnamon-calendar-server.py

@@ -13,7 +13,10 @@
 import gi
 gi.require_version('EDataServer', '1.2')
 gi.require_version('ECal', '2.0')
-gi.require_version('ICal', '3.0')
+try:
+    gi.require_version('ICal', '4.0')
+except ValueError:
+    gi.require_version('ICal', '3.0')
 gi.require_version('Cinnamon', '0.1')
 from gi.repository import GLib, Gio, GObject
 from gi.repository import EDataServer, ECal, ICal, ICalGLib