[FLINK-20268] [python] Regenerate Python SDK protocol Protobuf messages for new protocol

Regenerated with the following command (executed at project root):
protoc --python_out=statefun-python-sdk/statefun \
  --proto_path=statefun-flink/statefun-flink-core/src/main/protobuf \
  statefun-flink/statefun-flink-core/src/main/protobuf/request-reply.proto
1 file changed