HDBSCAN tests are failing on pypy #26541
Description
As seen in the nigthly build, a lot of hdbscan tests are failing in the pypy job.
Here's a link with the full failure report for some of them https://dev.azure.com/scikit-learn/scikit-learn/_build/results?buildId=55668&view=logs&jobId=0b16f832-29d6-5b92-1c23-eb006f606a66&j=0b16f832-29d6-5b92-1c23-eb006f606a66&t=0cdfadab-878f-502c-9df1-54a896e98c4f
Looks like the cause is always the same, but I couldn't figure out what it really is and how to solve it.
cc/ @Micky774