There is a new pull request by skmpz against master on the void-packages repository

https://github.com/skmpz/void-packages python3-msgpack-1.0.3
https://github.com/void-linux/void-packages/pull/35655

python3-msgpack: update to 1.0.3.
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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/35655.patch is attached