[firmitas] Make the cronjob run every week

This change is already done on production. So let's make it more
permanent.

See https://pagure.io/fedora-infrastructure/issue/12532#comment-969100
for more info.

roles/openshift-apps/firmitas/templates/cronjob.yml.j2

@@ -5,7 +5,7 @@ metadata:
   name: "{{firmitas_application_name}}"
   namespace: "{{firmitas_namespace}}"
 spec:
-  schedule: "0 0 1 * *"
+  schedule: "0 0 * * 0"
   timeZone: Etc/UTC
   concurrencyPolicy: "Forbid"
   startingDeadlineSeconds: 200