hdf5=1.10.6 (latest, mpich and nompi) can not be installed in parallel with ncl=6.6.2 (any hash)

[valeriupredoi]

An environment with the latest hdf5=1.10.6 (whether it be nompi or mpich, albeit we need mpich) can not pass the conda toll when installing ncl. This is bad for two reasons:

• Segmentation fault when running tests on CircleCI #644 is most probably due to the env reverting to the 7+ months old hdf5=1.10.5 (I ran multiple tests with the latest hdf5 on the CI machine and have not seen any segfault);
• we will have to upgrade to 1.10.6 at some point soon, ideally automatically via conda env solving, and this is not possible at the moment - the ncl meta says - hdf5 >=1.10.5,<1.10.6.0a0

[valeriupredoi]

NCAR/ncl#133

[valeriupredoi]

dis obsolete