heap-buffer-overflow in rans uncompress to 4x16

heap-buffer-overflow in rans uncompress to 4x16: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). AddressSanitizer: heap-buffer-overflow in function rans uncompress to 4x16 in file htslib/htscodecs/htscodecs/rANS static4x16pr.c