Log Message:
blosc: updated to 1.20.0

Changes from 1.19.1 to 1.20.0

More saftey checks have been implemented so that potential flaws
discovered by new fuzzers in OSS-Fuzzer are fixed now. Thanks to
Nathan Moinvaziri (@nmoinvaz).

BloscLZ updated to 2.3.0. Expect better compression ratios for faster
codecs. For details, see our new blog post:
https://blosc.org/posts/beast-release/

Fixed the _xgetbv() collision.

The chunk format has been fully described so that 3rd party software
may come with a different implementation, but still compatible with
C-Blosc chunks.