Update environment-win.yml

Author: jan-janssen

.ci_support/environment-win.yml

@@ -5,6 +5,6 @@ dependencies:
 - numpy
 - msmpi
 - cloudpickle =3.0.0
-- mpi4py =3.1.5
+- mpi4py =3.1.6
 - tqdm =4.66.2
 - pyzmq =25.1.2