There is an updated pull request by unspecd against master on the void-packages repository

https://github.com/unspecd/void-packages python3-zstandard
https://github.com/void-linux/void-packages/pull/49606

python3-zstandard: update to 0.22.0.
Also: use bundled libzstd instead of the system one: python3-zstandard requires the specific version of libzstd, 1.5.5.

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A patch file from https://github.com/void-linux/void-packages/pull/49606.patch is attached