Update htscodecs to v1.5.2 (2aca18b3)

[daviesrob]

• Fix illegal shift complaint from UBSAN
• Fix ARM compilation with certain Conda compilers
• Remove asserts from encode_freq1 and encode_freq_d
• Fix a 1 byte heap buffer overflow read.
• Add bounds checking to range coder.
• Make use of range-coder bounds checks in fqzcomp.
• Fix the output size estimation in compress_block_fqz2f.
• Fix buffer overflow in name tokeniser encoder.
• Add extra checking on 7-bit ASCII for name tokeniser inputs
• Correct a buffer read-overflow (max 8 bytes) in AVX2 rans decode
• Fix an overflow with freq=4096 in the SSE4 decoder.
• Remove divide by zero in rANS 4x8.
• r4x16pr: protect against input being NULL and in_size of zero.