add release notes

Author: schaubh

docs/source/Support/bskReleaseNotes.rst

@@ -32,6 +32,8 @@ Version |release|
 - Pinned python dependencies to avoid issues with new package versions.
 - Added a new github workflow job ``canary`` to routinely check the compatibility of latest python dependencies with python 3.13 on the latest mac-os.
 - Fixed a bug in :ref:`spiceInterface` where multiple instances of the module were not properly managing SPICE kernel references, leading to potential conflicts and data corruption.
+- Deprecated :ref:`SpacecraftSystem`.  It was never completed and we have other ways to connect spacecraft components
+
 
 Version 2.7.0 (April 20, 2025)
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