Changes to Per-source freshness map

the response property generated_at became nullable for the status 200

the global/date response's property type changed from string to string null, and format from date to date-time for status 200

the sources/items/official_url response's property type changed from string to string null, and format from no format to uri for status 200

removed the optional property sources/items/description from the response with the 200 status

removed the optional property sources/items/last_update from the response with the 200 status

removed the optional property sources/items/last_update_label from the response with the 200 status

removed the optional property sources/items/redistribute_ok from the response with the 200 status

removed the optional property sources/items/row_count from the response with the 200 status

removed the optional property sources/items/status from the response with the 200 status

removed the optional property sources/items/url from the response with the 200 status

added the new current enum value to the global/status response property for the response status 200

api operation id getSourcesFreshness was added

the endpoint scheme security apiKey was added to the API

the endpoint scheme security bearerAuth was added to the API

added the new optional header request parameter If-None-Match

added the non-success response with the status 304

added the non-success response with the status 429

added the non-success response with the status 503

added the optional property source_catalog_version to the response with the 200 status

added the optional property sources/items/data_updated_at to the response with the 200 status

added the optional property sources/items/license_url to the response with the 200 status

added the optional property sources/items/reviewed_at to the response with the 200 status

the response property sources/items/attribution_required became required for the status 200

the response property sources/items/license became required for the status 200

the response property sources/items/name became required for the status 200

the response property sources/items/slug became required for the status 200

removed the fresh enum value from the global/status response property for the response status 200

removed the recent enum value from the global/status response property for the response status 200

removed the very_stale enum value from the global/status response property for the response status 200

added the required property sources/items/catalog_version to the response with the 200 status

added the required property sources/items/freshness to the response with the 200 status

added the required property sources/items/policy_effective_date to the response with the 200 status

added the required property sources/items/reuse_conditions to the response with the 200 status

removed the optional property _disclaimer from the response with the 200 status

removed the optional property sources/items/hours_since from the response with the 200 status

removed the optional property sources/items/last_seen from the response with the 200 status

added the new empty enum value to the sources/items/status response property for the response status 200

added the new recent enum value to the sources/items/status response property for the response status 200

added the new static enum value to the sources/items/status response property for the response status 200

added the new very_stale enum value to the sources/items/status response property for the response status 200

added the optional property _legal_notice to the response with the 200 status

added the optional property count to the response with the 200 status

added the optional property generated_at to the response with the 200 status

added the optional property global to the response with the 200 status

added the optional property sources/items/attribution_required to the response with the 200 status

added the optional property sources/items/attribution_text to the response with the 200 status

added the optional property sources/items/description to the response with the 200 status

added the optional property sources/items/last_update to the response with the 200 status

added the optional property sources/items/last_update_label to the response with the 200 status

added the optional property sources/items/license to the response with the 200 status

added the optional property sources/items/official_url to the response with the 200 status

added the optional property sources/items/redistribute_ok to the response with the 200 status

added the optional property sources/items/row_count to the response with the 200 status

added the optional property sources/items/slug to the response with the 200 status

added the optional property sources/items/url to the response with the 200 status