add WIP changelog entry

PyO3 · Oct 30, 2024 · 245300b · 245300b
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+* The `pyclass` macro now creates a rust type that is `Sync` by default.  If you
+  would like to opt out of this, annotate your class with
+  `pyclass(unsendable)`. See the migraiton guide entry (INSERT GUIDE LINK HERE)
+  for more information on updating to accommadate this change.
+