[polari] ci: Remove duplicated cleanup

[Marge Bot <marge-bot src gnome org>]

commit f1fd001bf2ce737ebefede491a73ecb7843d4da8
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Feb 18 03:49:18 2022 +0100

    ci: Remove duplicated cleanup
    
    The template will already call `dnf clean all` after processing
    packages and the script, so no need for us to call it as well.
    
    Part-of: <https://gitlab.gnome.org/GNOME/polari/-/merge_requests/245>

 .gitlab-ci.yml | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index beccce19..d4885f73 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -65,8 +65,6 @@ workflow:
         https://gitlab.gnome.org/GNOME/gjs.git \
         1.71.1 . &&
 
-      dnf clean all
-
 .prereview_req: &prereview_req
   needs:
     - check_commit_log