[file-roller/wip/gtk4] ci: Fix Flatpak

[Jan Tojnar <jtojnar src gnome org>]

commit c2a9a1114ccdaaac13150fb32c532689b6f772db
Author: Jan Tojnar <jtojnar gmail com>
Date:   Sun Oct 2 22:22:22 2022 +0200

    ci: Fix Flatpak

 flatpak/org.gnome.FileRoller.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/flatpak/org.gnome.FileRoller.json b/flatpak/org.gnome.FileRoller.json
index f605fab7..76fc43b3 100644
--- a/flatpak/org.gnome.FileRoller.json
+++ b/flatpak/org.gnome.FileRoller.json
@@ -113,7 +113,7 @@
             "builddir": true,
             "config-opts": [
                 "-Ddocs=false",
-                "-Dbackends=gtk3"
+                "-Dbackends=gtk4"
             ],
             "sources" : [
                 {