[glib-networking/wip/nacho/openssl] Revert "Try upgrading CI to F29"

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 5800fdb4b9c2e32e3d12c42a0e01f141fbd06f3a
Author: Ignacio Casal Quinteiro <qignacio amazon com>
Date:   Fri Sep 21 09:38:23 2018 +0200

    Revert "Try upgrading CI to F29"
    
    This reverts commit 8b551b3fb2c4ad499a14fbadbb152463cd188ca1.
    Fedora 28 already contains openssl 1.1.0i

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d0e3390..68e0c74 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: fedora:29
+image: fedora:28
 
 variables:
   ADDITIONAL_DEPENDENCIES: gsettings-desktop-schemas gcc libasan openssl-devel