kernel-source from home:marec2000:kernel:5.14 project

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For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:marec2000:kernel:5.14/openSUSE_Leap_15.3/home:marec2000:kernel:5.14.repo
zypper refresh
zypper install kernel-source