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Add ParserOutput timestamp to fix Wikibase exception

Description

Add ParserOutput timestamp to fix Wikibase exception

https://gerrit.wikimedia.org/r/#/c/217007/ will also
solve the symptoms when deployed, but it's probably safer to have this
anyway.

Bug: T102874
Change-Id: I9daf356d8c9a981daecf93551fb474c1af3a4c3c