Check in migrations from django upgrade in PR #483

[hdoupe]

Most of these migrations are for the JSON field being moved to a different package in Django. These do not result in any actual changes in the DB.

The only SQL command run on the table is:

BEGIN;
--
-- Alter field provider_data on build
--
--
-- Alter field first_name on user
--
ALTER TABLE "users_user" ALTER COLUMN "first_name" TYPE varchar(150);
COMMIT;