[network-manager-sstp] Update .gitlab-ci.yml file, adding sstp-client-devel to dependency list

[Eivind Næss <eivnaes src gnome org>]

commit 43f2a86b41ef8181abde6c5f81ea1a830649b86d
Author: Eivind Næss <eivnaes yahoo com>
Date:   Tue Jun 8 21:53:30 2021 +0000

    Update .gitlab-ci.yml file, adding sstp-client-devel to dependency list

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9e47817..cf16e5b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -14,6 +14,7 @@
       glib2-devel
       gtk3-devel
       gnutls-devel
+      sstp-client-devel
       intltool
       libtool
       libsecret-devel