x11-toolkits/imgui: 1.92.1 => 1.92.4

Changelogs:
https://github.com/ocornut/imgui/releases/tag/v1.92.2
https://github.com/ocornut/imgui/releases/tag/v1.92.2b
https://github.com/ocornut/imgui/releases/tag/v1.92.3
https://github.com/ocornut/imgui/releases/tag/v1.92.4

PR: 290333
Approved by: Yuri Victorovich <yuri@freebsd.org> (maintainer, timeout 2 weeks)