Fix #9122 - Clear the cache when running the upgrade script #9256
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Fixes: #9122
Clearing the cache on upgrade prevents having a stale openapi definition.
I have an alternative version not adding a command and just calling
manage.py shell -i python .c <COMMAND>, however the clearcache command can also be use to clear for example the "new update" notification, which has been mentioned as an issue a couple of times (#8800).