gtk: set correct bug tracker

GTK hasn't used bugzilla for many years, switch the bug tracker fields
to gitlab.gnome.org.

(From OE-Core rev: 87e42afb25b3faa8dfae1e37118bf18b9f8b6531)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-gnome/gtk+/gtk+3_3.24.43.bb

@@ -2,7 +2,7 @@ SUMMARY = "Multi-platform toolkit for creating GUIs"
 DESCRIPTION = "GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete \
 set of widgets, GTK+ is suitable for projects ranging from small one-off projects to complete application suites."
 HOMEPAGE = "http://www.gtk.org"
-BUGTRACKER = "https://bugzilla.gnome.org/"
+BUGTRACKER = "https://gitlab.gnome.org/GNOME/gtk/-/issues/"
 SECTION = "libs"
 LIC_FILES_CHKSUM = "file://COPYING;md5=5f30f0716dfdd0d91eb439ebec522ec2 \
                     file://gtk/gtk.h;endline=25;md5=1d8dc0fccdbfa26287a271dce88af737 \

meta/recipes-gnome/gtk+/gtk4_4.18.6.bb

@@ -2,7 +2,7 @@ SUMMARY = "Multi-platform toolkit for creating GUIs"
 DESCRIPTION = "GTK is a multi-platform toolkit for creating graphical user interfaces. Offering a complete \
 set of widgets, GTK is suitable for projects ranging from small one-off projects to complete application suites."
 HOMEPAGE = "http://www.gtk.org"
-BUGTRACKER = "https://bugzilla.gnome.org/"
+BUGTRACKER = "https://gitlab.gnome.org/GNOME/gtk/-/issues/"
 SECTION = "libs"
 
 DEPENDS = " \