Update release date

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

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-Synapse 1.46.0rc1 (2021-10-26)
+Synapse 1.46.0rc1 (2021-10-27)
 ==============================
 
 The cause of the [performance regression affecting Synapse 1.44](https://github.com/matrix-org/synapse/issues/11049) has been identified and fixed. ([\#11177](https://github.com/matrix-org/synapse/issues/11177))