New issue by nonchip on void-packages repository

https://github.com/void-linux/void-packages/issues/12810
Description: xbps-update refuses to install a file collision for `libgstpython.so` because of python2/3 coexistence.

### System

* xuname:  
  `Void 5.1.5_1 x86_64 AuthenticAMD notuptodate rrrrmmnFFFFFFF`
* package:  
  * `gst1-python3-1.16.0_1`
  * `gst1-python-1.16.0_1`

### Expected behavior

this is a weird template, but i guess i'd expect it to not collide :stuck_out_tongue_closed_eyes: 

also i'd kinda expect libgstpython (which is a gstreamer binding for python, not a python interpreter for gstreamer) to live inside the python folders, not the gstreamer folders... this would also fix the collision because python2/3 have separate module folders.

### Actual behavior

```
ERROR: gst1-python3-1.16.0_1: file `/usr/lib/gstreamer-1.0/libgstpython.so' already installed by package gst1-python-1.16.0_1.
```

### Steps to reproduce the behavior

```
sudo xbps-install -Su
```