Bump SSSD Requires to 1.12.3
    
    The new SSSD Requires contains support for following features:
    - FreeIPA user ID View overrides (not just AD users)
    - User SSH public keys in ID Views
    - krb5.conf localauth plugin
    
    https://fedorahosted.org/freeipa/ticket/4685
    https://fedorahosted.org/freeipa/ticket/4509
    https://fedorahosted.org/freeipa/ticket/4514
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>