update api posts to latest fastapi

[Scartography]

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✅ All modified and coverable lines are covered by tests.

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[Scartography]

@ungarj I am quite spent today; but it seems fastapi accepts python dictionaries as json=job of type dict

This is me trying to release the fastapi restriction from versioning, to try to keep up with changes...might lead to mini release; maybe we can find some other features we might want to add/update like the test-run cmd.

[Scartography]

test pass, using headers={"Content-Type": "application/json"}, instead of data= or json= to post job.