fix(calendar-server): support ICal 4.0 with fallback from 3.0#13778

H09-0 wants to merge 2 commits into

linuxmint:masterlinuxmint/cinnamon:masterfrom

H09-0:fix/calendar-server-ical-versionH09-0/cinnamon:fix/calendar-server-ical-versionCopy head branch name to clipboard