Only python3.10 has a macos_universal binary on pypi

[nipunn1313]

https://pypi.org/project/protobuf/#files

What version of protobuf and what language are you using?
protobuf 3.19.1
python

What operating system (Linux, Windows, ...) and version?
mac Big Sur

What runtime / compiler are you using (e.g., python version or gcc version)
N/A

What did you do?
Look here https://pypi.org/project/protobuf/#files
Only the py310 files are built for mac universal. Rest only have x86.

What did you expect to see
Expected a universal binary for all of them.

I might be missing some rationale here - but this is what I noticed. Let me know if this doesn't make sense.

[deannagarcia]

Unfortunately we are not currently generating these binaries. However, we are currently working on creating mac universal binaries throughout protobuf releases. This is a longer term project and is related to #9397.

[deannagarcia]

This should be fixed with our new release assets in 4.21.1!