[zarith] Changelog

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+- **Changed:**
+  Coq's core system now uses the `zarith <https://github.com/ocaml/Zarith>`_
+  library, based on GNU's gmp instead of ``num`` which is
+  deprecated upstream. The custom ``bigint`` module is
+  not longer provided; note that the ``micromega`` still uses
+  ``num``
+  (`#11742 <https://github.com/coq/coq/pull/11742>`_,
+  by Emilio Jesus Gallego Arias and Vicent Laporte).