[gnome-boxes] ci: Drop "gtksourceview4-devel" Fedora dependency

[Felipe Borges <felipeborges src gnome org>]

commit 858c29417c71f6f1f6f77f47519d9bdccac9bfd0
Author: Felipe Borges <felipeborges gnome org>
Date:   Mon Aug 1 19:10:16 2022 +0200

    ci: Drop "gtksourceview4-devel" Fedora dependency
    
    We dropped the widget that used GtkSourceView in commit
    d61bb47bf8e76a4b5de3cff0d42d97340f82ca76

 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 18fc02b0..105c0f3d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -34,9 +34,9 @@ fedora:latest:
                      libgudev-devel webkitgtk4-devel libusbx-devel
                      tracker3-devel libosinfo-vala
                      python3-devel libxml2-devel
-                     libhandy1-devel gtksourceview4-devel
+                     libhandy1-devel
                      --nogpgcheck
 
     script:
         - meson _build .
-        - ninja -C _build
\ No newline at end of file
+        - ninja -C _build