Fix test_incompatible_dimensions test (#3977)

* test_incompatible_dimensions used a ragged array for the test, which has been deprecated in numpy, and now fails if dtype is anything other than object.  This test appears to be checking that the addition of a [2x4] masked array to a [2x3] masked cube should raise a ValueError. This commit fixes the creation of `data3` object to be a [2x4] non-ragged array.

* Added entry to what's new

* Added name to core developer list :)

* Update latest.rst

Fixed space in PR macro call

docs/iris/src/common_links.inc

@@ -42,6 +42,7 @@
 .. _@djkirkham: https://github.com/djkirkham
 .. _@DPeterK: https://github.com/DPeterK
 .. _@esc24: https://github.com/esc24
+.. _@jamesp: https://github.com/jamesp
 .. _@jonseddon: https://github.com/jonseddon
 .. _@jvegasbsc: https://github.com/jvegasbsc
 .. _@lbdreyer: https://github.com/lbdreyer

docs/iris/src/whatsnew/latest.rst

@@ -82,6 +82,7 @@ This document explains the changes made to Iris for this release
 
 #. `@rcomer`_ removed an old unused test file. (:pull:`3913`)
 
+#. `@jamesp`_ updated a test to the latest numpy version (:pull:`3977`)
 
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,

lib/iris/tests/test_basic_maths.py

@@ -853,7 +853,7 @@ def setUp(self):
 
     def test_incompatible_dimensions(self):
         data3 = ma.MaskedArray(
-            [[3, 3, 3, 4], [2, 2, 2]], mask=[[0, 1, 0, 0], [0, 1, 1]]
+            [[3, 3, 3, 4], [2, 2, 2, 2]], mask=[[0, 1, 0, 0], [0, 1, 1, 1]]
         )
         with self.assertRaises(ValueError):
             # Incompatible dimensions.