Rename properties cache to avoid collision with dtype instance cache

Author: fjetter

pandas/_libs/properties.pyx

@@ -23,10 +23,10 @@ cdef class CachedProperty:
             return self
 
         # Get the cache or set a default one if needed
-        cache = getattr(obj, '_cache', None)
+        cache = getattr(obj, '_property_cache', None)
         if cache is None:
             try:
-                cache = obj._cache = {}
+                cache = obj._property_cache = {}
             except (AttributeError):
                 return self