[issue39424] [easy] test_signal: test_pidfd_send_signal() uses deprecated assertRaisesRegexp() method

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch
pull_requests: +17652
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18277

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