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

gstreamer: update packages to 1.20.2
https://github.com/void-linux/void-packages/pull/37191

Description:

#### Testing the changes
- I tested the changes in this PR: **briefly**

only installed and tested packages. rest were only built

```
gst-libav
gst-plugins-bad1
gst-plugins-base1
gst-plugins-good1
gst-plugins-ugly1
gstreamer-vaapi
gstreamer1
gst-libav-32bit
gst-omx-32bit
gst-plugins-bad1-32bit
gst-plugins-base1-32bit
gst-plugins-good1-32bit
gstreamer-vaapi-32bit
gstreamer1-32bit
```

#### Local build testing
- I built this PR locally for my native architecture, **x86_64**