Protobuf compatibility could be relaxed

[plule-ansys]

I am currently using this template to try to make ansys-platform-instancemanagement (PyPIM) compatible with Python's protobuf 4, and it looks like the dependency statement toward protobuf is currently more restrictive than it should be, as the generated code is compatible with protobuf >4 out of the box. The code is currently generated with protoc 3.19, making it compatible with the protobuf package 4.x

protobuf~=3.19 could instead be protobuf>=3.19,<5.

I did an end to end test by regenerating PyPIM API package (ansys-api-platform-instancemanagement) with this template and using it with PyDPF and protobuf 4.22.3 with no issue.

[greschd]

Thanks @plule-ansys, I think that just got missing. See also https://github.com/ansys/ansys-tools-protoc-helper#upgrade-plans for compatibility charts.

[plule-ansys]

Oh I did not see that you had an upgrade plan in place already. Here is an article detailing that the code generated with protoc 3.19 is actually compatible with the package protobuf 4.21 and following: https://protobuf.dev/news/2022-05-06/#python-updates

It could mean that protobuf 4 is actually compatible with many pyansys libs

[greschd]

Yes, I think that's what this means. This was the reason for switching to 3.19 in the 0.4 release, but we missed it in the template.