$ git clone -n https://src.fedoraproject.org/rpms/icu4j.git /var/lib/mock/f39-build-1561388-37379/root/chroot_tmpdir/scmroot/icu4j
Cloning into '/var/lib/mock/f39-build-1561388-37379/root/chroot_tmpdir/scmroot/icu4j'...
$ git fetch origin a91ca6c379267a439003ea2073d5428e1427a6f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icu4j
 * [new ref]         a91ca6c379267a439003ea2073d5428e1427a6f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a91ca6c Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild