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Make `conclusion` nullable in `WorkflowJob.py` (#3171)

The value of `conclusion` in the Workflow Job object can be NULL:

![conclusion_nullable](https://github.com/user-attachments/assets/ae059547-f01e-4c33-bb7b-6ce134dc0d11)


GitHub doc reference:

https://docs.github.com/en/rest/actions/workflow-jobs?apiVersion=2022-11-28
Y
Yossi Rozantsev committed
8d8eb06d4361911dee8ebc3d3ad45bf7ba35974b
Parent: 5ec7b77
Committed by GitHub <noreply@github.com> on 2/14/2025, 7:31:00 PM