Zstandard 1.5.7 available

[stefano2734]

See
https://github.com/facebook/zstd/releases/tag/v1.5.7

[sebres]

Here is the new branch with newest zstd - zstd-1.5.7-br.
Binary artifact from GHA build - 7-Zip ZS Release binaries.zip
Test and review are welcome.
We'd let it mature over few days and would then merge it it to master.

[sebres]

Binaries link updated (after merge with current master - fix #391 is integrated).

[mcmilk]

I think we can pull it into master 👍

[sebres]

Done in df6fd53