db cannot migrate

[testkam2018]

during fresh install, we observed that db migrations could not be performed on Azure Flexible Server, because of this:
rails aborted!
ActiveRecord::StatementInvalid: PG::FeatureNotSupported: ERROR: extension "plpgsql" is not allow-listed for "azure_pg_admin" users in Azure Database for PostgreSQL (ActiveRecord::StatementInvalid)
HINT: to learn how to allow an extension or see the list of allowed extensions, please refer to https://go.microsoft.com/fwlink/?linkid=2281561

as per https://learn.microsoft.com/en-us/answers/questions/2259086/plpgsql-not-working-on-postgres-16-8-for-flexi-ser

this extensions now enabled by default, but still seems unavailable for use

please update the migration code as described in the link above