Make uncertainties compatible with numpy 2.0 (#245)

use `dot` and `isscalar` from `numpy` instead of older `numeric` in `unumpy.core` to work with Numpy 2.0

uncertainties/unumpy/core.py

@@ -20,7 +20,6 @@
 
 # 3rd-party modules:
 import numpy
-from numpy.core import numeric
 
 # Local modules:
 import uncertainties.umath_core as umath_core
@@ -585,10 +584,10 @@ def __rmul__(self, other):
         # scalar and of a matrix containing objects (when the
         # arguments are given in this order).  We go around this
         # limitation:
-        if numeric.isscalar(other):
-            return numeric.dot(self, other)
+        if numpy.isscalar(other):
+            return numpy.dot(self, other)
         else:
-            return numeric.dot(other, self)  # The order is important
+            return numpy.dot(other, self)  # The order is important
 
     def getI(self):
         """Matrix inverse or pseudo-inverse."""