Support Python 3 option in make upgrade jobs
Description
The "make upgrade" Jenkins jobs currently run with Python 2 by default, with no easy way to configure it. This isn't appropriate for repositories which already run only with Python 3. Add a configuration option to specify the Python version to be used for a given repository's dependency upgrade job.
Steps to Reproduce
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Current Behavior
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Expected Behavior
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Reason for Variance
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Release Notes
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User Impact Summary
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Done
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