Bug#1061710: gnome-terminal: Switch to GTK4 version

https://discourse.gnome.org/t/terminal-and-vte-news/20030 Thank you, Jeremy Bícha

Bug#1061710: gnome-terminal: Switch to GTK4 version

Source: gnome-terminal Version: 3.50.1-1 Severity: wishlist gnome-terminal has a preview release of a GTK4 version, 3.97.0. However, we cannot switch to it until the GTK4 accessibility issue is fixed that affects all GTK4 (or at least all GTK4 + vte) terminal apps.