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

https://github.com/motorto/void-packages gstreamer1-1.20.5
https://github.com/void-linux/void-packages/pull/41514

Gstreamer1 1.20.5 and friends
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#### Testing the changes
- I tested the changes in this PR: **briefly**

```
x86_64-musl
SUMMARY                                             
pkg                host         target       cross  result
gstreamer1         x86_64-musl  x86_64-musl  n      OK
gst-plugins-base1  x86_64-musl  x86_64-musl  n      OK
gst-plugins-bad1   x86_64-musl  x86_64-musl  n      OK
gst-plugins-good1  x86_64-musl  x86_64-musl  n      OK
gst-rtsp-server    x86_64-musl  x86_64-musl  n      OK
gst-plugins-ugly1  x86_64-musl  x86_64-musl  n      OK
gst-omx            x86_64-musl  x86_64-musl  n      OK
gst-libav          x86_64-musl  x86_64-musl  n      OK
```

A patch file from https://github.com/void-linux/void-packages/pull/41514.patch is attached