[issue30693] tarfile add uses random order

[Roundup Robot]

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


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nosy: +python-dev
nosy_count: 8.0 -> 9.0
pull_requests: +29831
pull_request: https://github.com/python/cpython/pull/31713

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30693>
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