Where do I find the original *.proto for the generated *.pb2.py?

[ScubaInstructor]

I need to update yowsup to work with protobuf 4.21.12
The .proto files need to be regenerated with a newer protoc (3.21.12).

I have the new protoc version for raspberry but I am not able to find the source files for:
./yowsup/layers/protocol_messages/proto/protocol_pb2.py
./yowsup/layers/protocol_messages/proto/e2e_pb2.py

Any ideas where to get them from?

I was able to update python-axolotl, the *.proto are provided but for yowsup they are missing.

I was able to create pb2.py files from serialzed_pb. Still it would be great to get the original proto files.