[network-manager-sstp] Update .gitlab-ci.yml file

[Eivind Næss <eivnaes src gnome org>]

commit 835b8b9597d51b230f4ab185067c4a7a2d126eb9
Author: Eivind Næss <eivnaes yahoo com>
Date:   Sun Jun 13 17:53:59 2021 +0000

    Update .gitlab-ci.yml file

 .gitlab-ci.yml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 748615d..cf16e5b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -27,7 +27,7 @@
 .dist: &dist
   stage: test
   dependencies:
-    - fedora31_dist
+    - fedora28_dist
   variables:
     GIT_STRATEGY: none
 
@@ -47,9 +47,9 @@
     - make -j uninstall
 
 # Roll the distribution tarball
-fedora31_dist:
+fedora28_dist:
   <<: *fedora_deps
-  image: fedora:31
+  image: fedora:28
   stage: build
   script:
     - dnf -y install