Updates to work with numpy 2.0 (#5979)

holoviews/core/util.py

@@ -1311,7 +1311,8 @@ def dimension_sort(odict, kdims, vdims, key_index):
 # Copied from param should make param version public
 def is_number(obj):
     if isinstance(obj, numbers.Number): return True
-    elif isinstance(obj, (np.str_, np.unicode_)): return False
+    elif isinstance(obj, np.str_): return False
+    elif np.__version__[0] < "2" and isinstance(obj, np.unicode_): return False
     # The extra check is for classes that behave like numbers, such as those
     # found in numpy, gmpy, etc.
     elif (hasattr(obj, '__int__') and hasattr(obj, '__add__')): return True
@@ -2274,9 +2275,9 @@ def numpy_scalar_to_python(scalar):
     Converts a NumPy scalar to a regular python type.
     """
     scalar_type = type(scalar)
-    if np.issubclass_(scalar_type, np.float_):
+    if issubclass(scalar_type, np.float64):
         return float(scalar)
-    elif np.issubclass_(scalar_type, np.int_):
+    elif issubclass(scalar_type, np.int_):
         return int(scalar)
     return scalar