Download proto file directly instead of via submodule

Author: berndverst

Makefile

@@ -11,7 +11,7 @@ install:
 	python3 -m pip install .
 
 gen-proto:
-	cp ./submodules/durabletask-protobuf/protos/orchestrator_service.proto durabletask/internal/orchestrator_service.proto
+	curl -o durabletask/internal/orchestrator_service.proto https://raw.githubusercontent.com/microsoft/durabletask-protobuf/refs/heads/main/protos/orchestrator_service.proto
 	python3 -m grpc_tools.protoc --proto_path=.  --python_out=. --pyi_out=. --grpc_python_out=. ./durabletask/internal/orchestrator_service.proto
 	rm durabletask/internal/*.proto