container-toolbox: Add psmisc
    
    It's currently being pulled in as a dependency of iproute.  However,
    since it's explicitly mentioned in the list of default packages on
    Fedora Silverblue and Workstation [1], it should be mentioned here too.
    
    The same change was also made to the Container/Dockerfile equivalent of
    the fedora-toolbox OCI images [2].
    
    [1] fedora-comps commit e4ed54dfcc497fd0
        https://pagure.io/fedora-comps/c/e4ed54dfcc497fd0
        https://pagure.io/fedora-comps/pull-request/379
    
    [2] Toolbx commit e41d920dd9a847cc
        https://github.com/containers/toolbox/commit/e41d920dd9a847cc
        https://github.com/containers/toolbox/pull/1390
    
    https://bugzilla.redhat.com/show_bug.cgi?id=2244503
    https://pagure.io/fedora-kickstarts/pull-request/1003