ownCloud 8.1.1 broke upgrades: do "occ upgrade" twice
ownCloud 8.1.1 broke upgrades: do "occ upgrade" twice

Per https://github.com/owncloud/core/issues/18224 and https://discourse.mailinabox.email/t/v13-upgrade-issue-with-calendar/757/10, upgrades from anything to ownCloud 8.1.1 were broken. But the workaround is to run the upgrade step twice.

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