Add a reminder here to unset the following maximum version number constraints, due to temporary issues/bugs in the upstream dependencies.

• (un)set h5py<3 due to fancy indexing via a mix of NumPy array and list not working for v3.1.0 h5py/h5py#1750
  • fix bool array index bug for h5 dataset #470
  • rollback to h5py native fancy indexing with version<3 #474
  • fix bool array index bug for h5py>=3 #743
• (un)set matplotlib<3.5 due to [Bug]: savefig pdf produces AttributeError: module 'unicodedata2' has no attribute 'ucnhash_CAPI' with matplotlib 3.5.0 matplotlib/matplotlib#21711
  • set matplotlib<3.5 temporarily due to upstream repo bug #704
  • env: revert matplotlib<3.5 & rm pykdtree/xarray/zarr #706