[ticket/12621] schema.json is not up to date with migration files

PHPBB3-12621
Merge pull request #2522 from PayBas/ticket/12621

[ticket/12621] schema.json is not up to date with migration files

* PayBas/ticket/12621:
  [ticket/12621] schema.json is not up to date with migration files
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12621] schema.json is not up to date with migration files