x11/libXrender: update to 0.9.11

Changes: https://gitlab.freedesktop.org/xorg/lib/libxrender/-/compare/libXrender-0.9.10...libXrender-0.9.11
Reviewed by: diizzy, jbeich
Tested by: arrowd
Pull Request: https://github.com/freebsd/freebsd-ports/pull/273
Sponsored by: Serenity Cybersecurity, LLC