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

https://github.com/ndowens/void-packages saml
https://github.com/void-linux/void-packages/pull/27050

python3-saml2: update to 6.4.1.
This fixes byte-compiling upon install

A patch file from https://github.com/void-linux/void-packages/pull/27050.patch is attached