OSV-2023-344 Heap-buffer-overflow in tok_get_normal_mode

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=58295 Crash type: Heap-buffer-overflow WRITE 1 Crash state: tokgetnormalmode PyTokenizerGet PyPegentokenizefullsourcetocheckforerrors...