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

https://github.com/Piraty/void-packages botan-2.19.1
https://github.com/void-linux/void-packages/pull/36646

botan: update to 2.19.1
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A patch file from https://github.com/void-linux/void-packages/pull/36646.patch is attached