[gnome-builder] update-manager: reduce warning severity to debug

[Christian Hergert <chergert src gnome org>]

commit c701f545ab7f0327ce939c767261dc5772a4e353
Author: Christian Hergert <chergert redhat com>
Date:   Tue Mar 2 11:36:20 2021 -0800

    update-manager: reduce warning severity to debug

 src/plugins/update-manager/gbp-update-manager-app-addin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/plugins/update-manager/gbp-update-manager-app-addin.c 
b/src/plugins/update-manager/gbp-update-manager-app-addin.c
index 18ea727ac..69d83e21f 100644
--- a/src/plugins/update-manager/gbp-update-manager-app-addin.c
+++ b/src/plugins/update-manager/gbp-update-manager-app-addin.c
@@ -210,7 +210,7 @@ gbp_update_manager_app_addin_start_cb (GObject      *object,
   g_assert (GBP_IS_UPDATE_MANAGER_APP_ADDIN (self));
 
   if (!xdp_portal_update_monitor_start_finish (portal, result, &error))
-    g_warning ("Failed to start update monitor: %s", error->message);
+    g_debug ("Failed to start update monitor: %s", error->message);
   else
     g_message ("Waiting for application updates from libportal");