Correct the schema number.
Correct the schema number.

Matches the latest migration here: https://github.com/alphagov/signonotron2/commit/a5950eb98f855988f9cff31e40f27219a49ab28b
alphagov/signonotron2,alphagov/signonotron2,alphagov/signonotron2,alphagov/signonotron2