OSV-2023-334 Heap-buffer-overflow in unicode_decode_utf8

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=58201 Crash type: Heap-buffer-overflow READ 1 Crash state: unicodedecodeutf8 PyUnicodeDecodeUTF8 PyPegenformattedvalue...