Merge pull request #591 from benjeffery/conda_fix

Downgrade h5py to fix conda version conflict

Author: mergify[bot]

requirements/CI-tests-conda/requirements.txt

@@ -2,4 +2,4 @@ lmdb==0.9.24
 msprime==1.0.2
 python-lmdb==0.96
 zarr==2.10.0
-h5py==3.3.0
+h5py<3.2