Add compute response schema for microversion 2.96

Compute microversion 2.96 added the pinned_availability_zone field to
the GET /servers/detail and GET /servers/{server_id} responses.

https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#maximum-in-2024-1-caracal-and-2024-2-dalmatian

Change-Id: I7b1e32b7ac3622029336f1919fb5cc2731050a2d
diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index 20ace9e..33e75ff 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -454,6 +454,10 @@
 
   .. _2.86: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id79
 
+  * `2.96`_
+
+  .. _2.96: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#maximum-in-2024-1-caracal-and-2024-2-dalmatian
+
 * Volume
 
   * `3.3`_