fix: remove all mentions of cumproduct (#1954)

numpy=2.0 will bring a lot of breaking changes, including the removal of cumproduct. numpy.cumproduct is already deprecated in favor of numpy.cumprod in 1.25; and cumprod is available in 1.23+

pint/facets/numpy/numpy_func.py

@@ -965,7 +965,7 @@ def implementation(a, *args, **kwargs):
         return a._REGISTRY.Quantity(func(a_stripped, *args, **kwargs))
 
 
-for func_str in ("cumprod", "cumproduct", "nancumprod"):
+for func_str in ("cumprod", "nancumprod"):
     implement_single_dimensionless_argument_func(func_str)
 
 # Handle single-argument consistent unit functions

pint/testsuite/test_numpy.py

@@ -380,12 +380,7 @@ def test_cumprod(self):
     def test_cumprod_numpy_func(self):
         with pytest.raises(DimensionalityError):
             np.cumprod(self.q)
-        with pytest.raises(DimensionalityError):
-            np.cumproduct(self.q)
         helpers.assert_quantity_equal(np.cumprod(self.q / self.ureg.m), [1, 2, 6, 24])
-        helpers.assert_quantity_equal(
-            np.cumproduct(self.q / self.ureg.m), [1, 2, 6, 24]
-        )
         helpers.assert_quantity_equal(
             np.cumprod(self.q / self.ureg.m, axis=1), [[1, 2], [3, 12]]
         )