copr-builders: don't update kernel-core in AWS images (again)

https://bugzilla.redhat.com/show_bug.cgi?id=2047266

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -32,6 +32,11 @@
   dnf:
     state: latest
     name: "*"
+    exclude:
+      # https://bugzilla.redhat.com/show_bug.cgi?id=2047266
+      # This is important for the AWS images only.  Other images (like libvirt,
+      # IBM Cloud, etc.) are already updated.
+      - kernel-core
   when: prepare_base_image is defined
   register: system_updated