There's a closed pull request on the void-packages repository

 gstreamer1: update to 1.18.2
https://github.com/void-linux/void-packages/pull/26411

Description:
gst1-python version 1.18.1 doesn't support python2 anymore so can not update it

If someone can test update please let me know if update works fine.

For me, no matter gst version I have installed I can't not get audio out from an app that depends on gstreamer