Changes to List startups

the response property data/items/created became nullable for the status 200

the response property data/items/display_name became nullable for the status 200

the response property data/items/icon_url became nullable for the status 200

the response property data/items/website_url became nullable for the status 200

the response property data/items/created became optional for the status 200

the object response property const value list was removed for the status 200

the object response property const value startup was removed for the status 200

the data/items/created response's property type changed from integer to integer null, and format from no format to int64 for status 200

the error response's property type changed from object to no type for status 500

removed the required property error/message from the response with the 500 status

removed the required property error/type from the response with the 500 status

removed the optional property error/code from the response with the 500 status

removed the optional property error/param from the response with the 500 status

api operation id listStartups removed and replaced with list_startups

removed the non-success response with the status 400

removed the non-success response with the status 401

removed the non-success response with the status 402

removed the non-success response with the status 403

removed the non-success response with the status 410

removed the non-success response with the status 422

removed the non-success response with the status 429

removed the non-success response with the status 503

added ErrorBody to the error response property allOf list for the response status 500

the response property data/items/object became required for the status 200

the response property object became required for the status 200

the object response's property default value list was removed for the status 200

the object response's property default value startup was removed for the status 200

response property data/items/display_name list-of-types was narrowed by removing types null from media type application/json of response 200

response property data/items/icon_url list-of-types was narrowed by removing types null from media type application/json of response 200

response property data/items/website_url list-of-types was narrowed by removing types null from media type application/json of response 200