www/pmwiki: Update 2.6.0 => 2.7.3
Changelog:
https://www.pmwiki.org/wiki/PmWiki/ChangeLog#v273
Release Notes:
https://www.pmwiki.org/wiki/PmWiki/ReleaseNotes#v273
PR: 297175
Reported by: Martin Neubauer <m.ne@gmx.net> (maintainer)
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q3
(cherry picked from commit 6f2c95b48ed61cec34fd9e69519f1a5c9c5ed6d8)