update doc for ci changes

Author: zm711

doc/source/releases/0.14.0.rst

@@ -17,7 +17,11 @@ Neo now has a limit of NumPy >= 1.22.4
 CI Improvements
 ---------------
 
-A bug in the CI was fixed which ensures testing on the lowest (3.9) and highest (3.13) supported Python versions for :code:`RawIO` and :code:`IO` testing.
+To ensure compatiblility between pre- and post- NumPy 2.0 the CI was changed to test on the lowest supported Python (3.9) and
+the highest supported Python (3.13) each with NumPy 1.26 as well as NumPy 2.0 for all :code:`RawIO` and :code:`IO` tests.
+
+We also no longer use a cached conda env for testing as we see that there is no speed benefit to caching and we had some issues
+with the caches getting corrupted.
 
 Testing of additional Python-NumPy combinations for core tests were added (NumPy 2.0 and 2.1 with their respective Python versions).