[gnome-runtime-images] Fix typo for 42

[Jordan Petridis <jpetridis src gnome org>]

commit 9c91c8079e98b8f101e7e9697a098471db861091
Author: Jordan Petridis <jordan centricular com>
Date:   Sun Apr 3 01:22:19 2022 +0300

    Fix typo for 42

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 08048b5..cbc9317 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -162,4 +162,4 @@ gnome:41:
 
 gnome:42:
   stage: 'runtimes'
-  extends: ['.sdk_template', '.vars_41']
\ No newline at end of file
+  extends: ['.sdk_template', '.vars_42']
\ No newline at end of file