Update changelog v1.85.1

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diff --git a/CHANGES.md b/CHANGES.md

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 Synapse 1.85.1 (2023-06-07)
 ===========================
 
+Note: this release only fixes a bug that stopped some deployments from upgrading to v1.85.0. There is no need to upgrade to v1.85.1 if successfully running v1.85.0.
+
 Bugfixes
 --------