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

https://github.com/jcgruenhage/void-packages gnupg-2.4.0_1
https://github.com/void-linux/void-packages/pull/41270

gnupg: update to 2.4.0.
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#### Testing the changes
- I tested the changes in this PR: **YES**

I'd like others to test this as well. Last time, we've had problems with people
running into issues. <del>And we've got an additional problem this time, because
their test suite isn't passing, which at least some other distros are also
running into.</del> I'd like to keep this open as a draft for now, but I'm using it
for now.

EDIT: The problem with the test suite has been fixed by applying an upstream patch, thanks for the help with automake @kruceter 

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A patch file from https://github.com/void-linux/void-packages/pull/41270.patch is attached