Workflow history API returns improper error code for updating completed workflow

[jacobtylerwalls]

400 (Bad Request) would be more accurate than 401 (Not Authorized) for attempting to update a completed workflow.

Suggesting to target 7.6, as this isn't severe enough to have blocked a release.

arches/arches/app/views/workflow_history.py

Lines 65 to 71 in a1c2b42

	if not created:
	if history.completed:
	return JSONErrorResponse(
	_("Request Failed"),
	_("Workflow already completed"),
	status=401,
	)