add changelog

diff --git a/doc/build/changelog/unreleased_20/11724.rst b/doc/build/changelog/unreleased_20/11724.rst
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+.. change::
+    :tags: bug, postgresql
+    :ticket: 11724
+
+    Fixes issue in `get_multi_indexes` in postgresql dialect, where an error
+    would be thrown when attempting to use alembic with a vector index from
+    the pgvecto.rs extension.