update protobuf version in workflow

Signed-off-by: Filinto Duran <[email protected]>

Author: filintod

ext/dapr-ext-workflow/setup.cfg

@@ -27,6 +27,11 @@ install_requires =
     dapr-dev >= 1.15.0.dev
     durabletask-dapr >= 0.2.0a7
 
+    # protobuf dependency constrained per durabletask grpc generator
+    # in https://github.com/dapr/durabletask-python/blob/main/dev-requirements.txt
+    # check install_requires in https://github.com/grpc/grpc/blob/master/tools/distrib/python/grpcio_tools/setup.py#L349
+    protobuf>=6.31.0,<7.0.0
+
 [options.packages.find]
 include =
     dapr.*