fix: generated code imports

proto/generate_code_python.sh

@@ -42,4 +42,4 @@ python3 -m grpc_tools.protoc -I=./ --python_out=src/python/ --grpc_python_out=sr
 python3 -m grpc_tools.protoc -I=./ --python_out=src/python/asyncio --grpclib_python_out=src/python/asyncio *.proto
 
 # Arrange generated code imports to enable imports from arbitrary subpackages
-find src/python -type f -iname *.py -exec sed -i -E 's/(import\ .*)_pb2/from . \1_pb2/g' {} \;
+find src/python -type f -iname *.py -exec sed -i -E 's/^(import\ .*)_pb2/from . \1_pb2/g' {} \;