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gh-144475: Add NEWS entry for functools.partial.__repr__ fix

Author: Nicolas0315

Misc/NEWS.d/next/Library/2026-03-02-02-30-00.gh-issue-144475.CfVOu8Hi.rst

@@ -0,0 +1,6 @@
+Fix a heap-buffer-overflow in :func:`functools.partial.__repr__` where a
+user-defined :meth:`~object.__repr__` on an argument could mutate the
+:class:`~functools.partial` object via :meth:`~functools.partial.__setstate__`,
+freeing the args tuple while iteration was still in progress. The fix holds
+strong references to the ``args`` tuple, ``kw`` dict, and ``fn`` callable
+during formatting.