oodle crash in rrFP32_to_FP16_Array_AVX2

Crashing compressing a HDR texture with oodle version 2.9.12 but no issue with 2.9.11

Fixed in .13!

See https://www.radgametools.com/oodlehist.htm

fix : Texture : Fix rare crash when encoding BC6 textures (potential OOB read but not write in tail handling of AVX2 float32->float16 pixel format conversion).

Thanks