devel/dbus: Remove patch-dbus_dbus-connection.c that is included upstream

[longros]

Summary

Upstream commit:
https://gitlab.freedesktop.org/dbus/dbus/-/commit/686229edd51a3d093002aff28289ca971a51cc37

Also add a VuXML entry for the denial-of-service fixes in 1.16.4 (CVE-2026-120749 and others)

Test Plan

poudriere bulk -t on 14.4, 14.5 and 15.1 amd64 (main and 2026Q4): PASS
VuXML: make validate passes.

[arrowd]

This is weird. GitLab says that this change is indeed included in 1.16.4, but this patch applies correctly during the port's build. Without this patch I still see timeout_milliseconds - elapsed_milliseconds in dbus-connection.c.

[longros]

Add VuXML entry for the denial-of-service fixes in 1.16.4