Inspect numerical test failures

[astrojuanlu]

Comes from #1511.

[astrojuanlu]

Yep, main is broken at the moment.

[astrojuanlu]

Docs are failing because:

WARNING: failed to reach any of the inventories with the following issues:
intersphinx inventory 'https://docs.scipy.org/doc/scipy-1.8.0/html-scipyorg/objects.inv' not fetchable due to <class 'requests.exceptions.HTTPError'>: 404 Client Error: Not Found for url: https://docs.scipy.org/doc/scipy-1.8.0/html-scipyorg/objects.inv
intersphinx inventory has moved: https://matplotlib.org/objects.inv -> https://matplotlib.org/stable/objects.inv

[astrojuanlu]

Recent failure: https://app.circleci.com/pipelines/github/poliastro/poliastro/156/workflows/73475ba6-9623-4f9d-9cc2-26501820378c/jobs/6847

Last successful build on main: https://app.circleci.com/pipelines/github/poliastro/poliastro/142/workflows/bb55156a-6c8f-4550-9024-0f060bddbb9e/jobs/6738

These are some important dependency changes I noticed:

astropy 5.0.4 -> 5.1
numpy 1.21.6 -> 1.22.4
numba 0.55.1 -> 0.55.2
scipy 1.8.0 -> 1.8.1

Running the tests with NUMBA_DISABLE_JIT=1 locally makes them pass. And reverting to numba ==0.55.1 makes them pass too. Trying that out for now.

[astrojuanlu]

It was not numba actually, it was a combination of latest Numba with latest NumPy: numba/numba#8141

[astrojuanlu]

I'll enable automerge here. If all checks pass, we'll put this in.

[astrojuanlu]

Still no dice 🙃 Will try one more thing

[astrojuanlu]

Opened #1517 to address the xfail tests at some point.