Revert "packages-override: unpin s390utils-base"

This reverts commit b82bbaf.

We still have the old coreos-installer and ostree-2025 RPMs
currently, so we still need to pin it.

Author: joelcapitao

packages-overrides.yaml

@@ -10,6 +10,13 @@ conditional-include:
 ##      - c9s-appstream-mirror
 ##    packages:
 ##      - foo-1.2
+  - if:
+    - osversion == "rhel-9.6"
+    - basearch == "s390x"
+    include:
+      packages:
+        # https://github.com/openshift/os/issues/1731
+        - s390utils-base-2.33.1-2.el9
   - if:
     - osversion == "centos-10"
     include: