Issue 50660 - Build failure on Fedora 31
    
    Bug Description:
    node-sass v4.11 is not compatible with nodejs-12 that is shipped with
    Fedora 31.
    
    Fix Description:
    Bump node-sass version to v4.12
    
    Relates/Fixes: https://pagure.io/389-ds-base/issue/50660
    
    Reviewed by: ???