[gtk/ebassi/ci-timeout] Add the filtermodel-exhaustive test to the slow suite

[Emmanuele Bassi <ebassi src gnome org>]

commit ad04da84c965f37f7d6b3a1fbb07d2bdafa484d2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Jul 10 16:16:15 2020 +0100

    Add the filtermodel-exhaustive test to the slow suite
    
    This increases the default timeout.

 testsuite/gtk/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index d725d992f6..fb6c387fbf 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -30,7 +30,7 @@ tests = [
   ['expression'],
   ['filter'],
   ['filterlistmodel'],
-  ['filterlistmodel-exhaustive'],
+  ['filterlistmodel-exhaustive', [], [], [], ['slow']],
   ['flattenlistmodel'],
   ['floating'],
   ['flowbox'],