PYTHON-5251 Update changelog for 1.13 release (#994)

Author: blink1073

bindings/python/CHANGELOG.rst

@@ -4,9 +4,9 @@ Changelog
 Changes in Version 1.13.0
 -------------------------
 
-- Bundle libmongocrypt 1.13.0 in release wheels.
-- Add support for the key_expiration_ms option to MongoCryptOptions.
-- Add support for $lookup in CSFLE and QE.
+- Bundle libmongocrypt 1.13.1 in release wheels.
+- Add support for the ``key_expiration_ms`` option to ``MongoCryptOptions``.
+- Add support for ``$lookup`` in CSFLE and QE.
 
 Changes in Version 1.12.0
 -------------------------