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

https://github.com/ahesford/void-packages pam-base
https://github.com/void-linux/void-packages/pull/18447

pam-base: add support for pam-gnupg-git package
Now that pam-gnupg-git has been merged, add (optional) support for the module in the pam-base configs.

A patch file from https://github.com/void-linux/void-packages/pull/18447.patch is attached