Update the reference of root-soil-benchmark-kernel-c12b
What this MR does / why does DuMux need it:
test-root-soil-benchmark-kernel-c12b failed for me locally. After updating the reference solution, it passed.
Edited by Maziar Veyskarami
What this MR does / why does DuMux need it:
test-root-soil-benchmark-kernel-c12b failed for me locally. After updating the reference solution, it passed.