Try pinning cython as less than 3

Author: lmcinnes

setup.py

@@ -51,7 +51,7 @@ def requirements():
 
 configuration = {
     'name': 'hdbscan',
-    'version': '0.8.31',
+    'version': '0.8.32',
     'description': 'Clustering based on density with variable density clusters',
     'long_description': readme(),
     'classifiers': [