[3.21] main/python3: patch CVE-2024-12254

Add patch to fix CVE-2024-12254: "Unbounded memory buffering in SelectorSocketTransport.writelines()".

• https://mail.python.org/archives/list/security-announce@python.org/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB/
• https://github.com/python/cpython/issues/127655
• https://github.com/python/cpython/pull/127656