Allow dolfinx.fem.Constant to take native float as value type (#3847)

* Allow constant to take native float as value type

* Update python/dolfinx/fem/function.py

Co-authored-by: Paul T. Kühner <56360279+schnellerhase@users.noreply.github.com>

* Run ruff

---------

Co-authored-by: Paul T. Kühner <56360279+schnellerhase@users.noreply.github.com>
Co-authored-by: Garth N. Wells <gnw20@cam.ac.uk>

Author: 3 people

python/dolfinx/fem/function.py

@@ -38,7 +38,9 @@ class Constant(ufl.Constant):
     ]
 
     def __init__(
-        self, domain, c: typing.Union[np.ndarray, Sequence, np.floating, np.complexfloating]
+        self,
+        domain,
+        c: typing.Union[float, np.floating, complex, np.complexfloating, Sequence, np.ndarray],
     ):
         """A constant with respect to a domain.