Consider listing required protobuf version

[thegoldenmule]

Currently, with each release, we see the required nakama-commons version listed alongside the nakama version.

But often we also find that when we upgrade (we just went from .25 to .33, which is only a minor version) we need to also pin the protobuf version, even though it is only an indirect dependency:

As the title suggests, perhaps you could also specify the protobuf version we need to pin.

[linear]

NK-1664 Consider listing required protobuf version