New canonical form for ISNI URIs

As part of a recent security review and the migration of the ISNI website to a more trusted https environment, ISNI International Agency revisited the preferred format for representing ISNI identiers. The canonical ISNI URI now incorporates the change from http to https so that all ISNI URIs are now of the pattern https://isni.org/isni/ID, where ID is the 16-digit ISNI (without
any spaces) – for example https://isni.org/isni/000000012124423X.