Fix test_refcycle_unraisiable_warning_filter_default
#13191
Merged
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In #11671 (comment) I hit a funky interaction where py39-pluggy started failing because the subprocess started triggering gc.
The patch is from #11671 (comment) after graingert noticed the faulty assumption that
with _disable_gc
would have any effect in a subprocess.The CI only appears to fail in #11671, presumably because of pytest itself getting slightly bigger and triggering a gc, or something.