textproc/py-pystache: Maintainer reset

Based on 7.5 months timeout in bug#221411.
PHB Section 5.5: If the maintainer does not respond within three months,
... then that maintainer is considered absent
... and can be replaced as the maintainer of the particular port in question.

PR: 221411
Reported by: tobik
Approved by: culot (maintainer's timeout; 7.5 months)