[gtkmm/kjellahl/testci] CI: Try building gtk4, take 2

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 5031eb1812046c5cdab435f77806a03e5bfb0fa1
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Feb 9 16:04:09 2022 +0100

    CI: Try building gtk4, take 2

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 05266264..803ad7a6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,6 +30,7 @@ variables:
                    libgstreamer-plugins-base1.0-dev
                    libgstreamer-plugins-good1.0-dev
                    libgstreamer-plugins-bad1.0-dev
+                   libgudev-1.0-dev
   GIO_EXTRA_MODULES: "/usr/lib/x86_64-linux-gnu/gio/modules"
   GIT_SUBMODULE_STRATEGY: normal