net/libvncserver: update to 0.9.13
- Pass maintainership
Changes: https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.13
ABI: https://abi-laboratory.pro/tracker/timeline/libvncserver/
PR: 251649
Submitted by: Neel Chauhan <neel@neelc.org>
Reviewed by: daniel.engberg.lists@pyret.net