TST: enable CPython free-threading support #468
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andfoy
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This PR enables free-threading builds of bottleneck, available from Python 3.13 onwards, this new distribution allows Python packages to leverage true parallel support, as the GIL is now optional.
In particular, this PR performs the following checks:
pytest-run-parallel, which allows pytest suites to be run concurrently (per test). This analysis didn't throw any major concurrency-related issues, the only tests that were marked as thread-unsafe were related to memory usage checking and concurrent file overwriting.