print/ghostscript9-agpl-*: deprecate and set expiration date to 2023-12-31

Ghostscript 10 has been released more than a year ago. From that date
Ghostscript 9 is not supported by upstream anymore.

PR: 272131
Approved by: jrm (mentor), maintainer timeout
Differential Revision: https://reviews.freebsd.org/D42352