concurrent from systemsmanagement:Uyuni:Master:Other project

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For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:Uyuni:Master:Other/openSUSE_Leap_15.4/systemsmanagement:Uyuni:Master:Other.repo
zypper refresh
zypper install concurrent