TST: yt/tests/test_load_archive.py::test_load_archive is failing

[neutrinoceros]

For instance, see https://github.com/yt-project/yt/actions/runs/7733683213/job/21093334760?pr=4797

The failure is due to a combination of a couple factors:

• Python 3.12 introduced a DeprecationWarning about use of os.fork() in multi-threaded processes (this is gh-100228: Warn from os.fork() if other threads exist. python/cpython#100229)
• Pytest 8.0 was just released a couple days ago. Up until version 7.4.4, unmatched warnings in a pytest.warns context would be swallowed silently, which is why we haven't caught this before. (see Document that with pytest.warns() captures all warnings, not just those it tests were emitted pytest-dev/pytest#9288)

Note that the failing test requires ratarmount (Linux only) and Python 3.12, so it's still pretty mild, as far as failures go. I suppose it should be escalated upstream to ratarmount, and the warning should be ignored on our side, as it seems out of our control.
What do you think @cphyc ?

[cphyc]

I think the way forward is:

1. On the short term, this is fixed by Catch Py312+ warning when using ratarmount #4819 that ignores the warning on Python 3.12,
2. On the longer term, update the version of ratarmount. At the moment, we're using 0.8.1 but the latest version is now 0.14!