When in-place upgrade using ISO image by ' leapp upgrade --iso' command, failed with error: ['--iso', '/XXX/rhel-XXX-x86_64-dvd.iso']

Issue

• Failed to in-place upgrade by using ISO image as described in Upgrading from RHEL 7 to RHEL 8 and Upgrading from RHEL 8 to RHEL 9

• '--iso' option in leapp command does not work and fails with error below:

  $ leapp preupgrade --no-rhsm --iso /iso/rhel-8.8-x86_64-dvd.iso
    usage: leapp preupgrade [-h] [--report-schema {1.0.0,1.1.0,1.2.0}]
                            [--target {8.4,8.6}] [--channel {ga,tuv,e4s,eus,aus}]
                            [--enablerepo <repoid>] [--no-rhsm] [--verbose]
                            [--debug] [--whitelist-experimental ActorName]
    ....
    ....
    error: ['--iso', '/iso/rhel-8.8-x86_64-dvd.iso']