ci: replace iris_file_list anchor with reference

Signed-off-by: Eric Engestrom <eric@igalia.com>
Acked-by: David Heidelberg <david.heidelberg@collabora.com>
Acked-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24099>

.gitlab-ci/test-source-dep.yml

@@ -791,9 +791,7 @@
     - changes:
         *virgl_file_list
       when: manual
-    - changes:
-        *iris_file_list
-      when: manual
+    - !reference [.iris-manual-rules, rules]
 
 .virgl-iris-rules-performance:
   stage: layered-backends