Update as of August 9th, 2023: The extension has been extended until December 31st, 2023. DocuSign emphasizes that no further exceptions will be made beyond this date. Documentation from their side regarding this has not been updated as of now, but they have confirmed that it will be published this month.
Original as of July 10th, 2023:
DocuSign has announced the retirement of basic authentication (read more), with the official cut-off date set for August 31st, 2023. If you are currently using DocumentsCorePack in conjunction with DocuSign, it is crucial that you take action to ensure the continued functionality of this integration before that date.