Plasma 5.21 schedule update

[Jonathan Riddell]

As discussed yesterday I've updated the schedule for 5.21 so it doesn't
clash with hogmanay, everything moved 1 week later except for 5.21.5 bugfix
release.

https://community.kde.org/Schedules/Plasma_5#Future_releases

https://phabricator.kde.org/calendar/

https://calendar.google.com/calendar?cid=MDMxZ2tncWcxaGpmOGxjbWowZW0xZDJzajhAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ
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