Merge branch 'fix-add-column-with-default-null' into 'master'
Fix `#down` for two protected branches-related migrations. - The migrations called `add_column_with_default` with a `null` option, which the Rails `add_column` method accepts. This fails because `add_column_with_default` expects an `allow_null` option instead. - The migrations have been fixed to use `allow_null`. See merge request !5660
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