[gnome-books] ci: fix syntax

[Jordan Petridis <jpetridis src gnome org>]

commit 6605669ab4c94b36e5cd3185f9c801d2392ab56a
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sun Aug 2 14:34:57 2020 +0000

    ci: fix syntax
    
    They are arrays, not stings. Copy paste properly...

 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1c77abc0..5476b459 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -22,5 +22,5 @@ flatpak:master:
 
 nightly:
     extends: '.publish_nightly'
-    dependencies: 'flatpak:master'
-    needs: 'flatpak:master'
+    dependencies: ['flatpak:master']
+    needs: ['flatpak:master']