Changes to Update a stock item

added the new optional request property data/attributes/low_quantity

added the optional property data/attributes/low_quantity to the response with the 200 status

added the new required request property data/relationships/sku/data

added the new required request property data/relationships/stock_location/data

request property data/type was restricted to a list of enum values

removed the request property data/relationships/sku/id

removed the request property data/relationships/sku/type

removed the request property data/relationships/stock_location/id

removed the request property data/relationships/stock_location/type

added the new optional request property data/attributes/_validate

the request property data/attributes/metadata became nullable

the request property data/attributes/reference became nullable

the request property data/attributes/reference_origin became nullable

the request property data/attributes/sku_code became nullable

the type request property default value stock_items was removed

added the new stock_items enum value to the request property data/type

added the media type application/vnd.api+json for the response with the status 200