x11-fonts/py-cu2qu: Mark DEPRECATED and set EXPIRATION_DATE to 2026-05-31

from GitHub:
This repository has been archived by the owner on Aug 9, 2023. It is now read-only.

from README.rst:
This library is now maintained as part of https://github.com/fonttools/fonttools

PR: 295166
Reference: https://github.com/googlefonts/cu2qu/commit/b8a8e7a3fca34c799b2fc3ba4eda43714d1ad277
Approved by: maintainer (timeout, 16 days)