also add gi-gtk3 together with gi-gdk3

Author: juhp

build-constraints.yaml

@@ -3430,6 +3430,7 @@ packages:
         - gi-dbusmenu
         - gi-dbusmenugtk3
         - gi-gdk < 0
+        - gi-gdk3
         - gi-gdk4
         - gi-gdkpixbuf
         - gi-gdkx11 < 0
@@ -3440,6 +3441,7 @@ packages:
         - gi-graphene
         - gi-gsk
         - gi-gtk
+        - gi-gtk3
         - gi-gtk4
         - gi-gtk-hs
         - gi-gmodule