Changes to Get collections by slugs

the response property collections/items/banner_image_url became nullable for the status 200

the response property collections/items/category became nullable for the status 200

the response property collections/items/description became nullable for the status 200

the response property collections/items/discord_url became nullable for the status 200

the response property collections/items/image_url became nullable for the status 200

the response property collections/items/instagram_username became nullable for the status 200

the response property collections/items/owner became nullable for the status 200

the response property collections/items/project_url became nullable for the status 200

the response property collections/items/telegram_url became nullable for the status 200

the response property collections/items/twitter_username became nullable for the status 200

the response property collections/items/wiki_url became nullable for the status 200

added the media type */* for the response with the status 400

added the optional property code to the response with the 401 status

added the optional property code to the response with the 403 status

added the optional property code to the response with the 404 status

added the optional property code to the response with the 409 status