Changes to Get network stake information

the response property _status/messages/items/data became nullable for the status 400

the response property _status/messages/items/data became nullable for the status 404

the response property _status/messages/items/data became nullable for the status 500

the response property _status/messages/items/detail became nullable for the status 400

the response property _status/messages/items/detail became nullable for the status 404

the response property _status/messages/items/detail became nullable for the status 500

the response property staking_period/allOf[#/components/schemas/TimestampRange]/to/allOf[#/components/schemas/TimestampNullable] became nullable for the status 200