update version in service.py

Author: VegetarianOrc

temporalio/service.py

@@ -22,7 +22,7 @@
 import temporalio.exceptions
 import temporalio.runtime
 
-__version__ = "1.18.1"
+__version__ = "1.19.0"
 
 ServiceRequest = TypeVar("ServiceRequest", bound=google.protobuf.message.Message)
 ServiceResponse = TypeVar("ServiceResponse", bound=google.protobuf.message.Message)