install astropy from bleeding edge and pin several requirements
Changes from celery-5 branch to get to the point where the CI pipelines pass.
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Issue with jinja and pytest loader: https://github.com/pallets/jinja/issues/1168 Breaking change reverted in 2.11.2 and postponed to 3.0
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Sphinx 4.1.1 fails, pinning 2.0 downgrade jinja, pin sphinx version, install astropy from bleeding edge
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flask breaking changes in 2.0, 1.1.4 is latest current version
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werkzeug breaking changes in 2.0