[issue5846] Deprecate obsolete functions in unittest

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +serhiy.storchaka
nosy_count: 4.0 -> 5.0
pull_requests: +26717
pull_request: https://github.com/python/cpython/pull/28303

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<https://bugs.python.org/issue5846>
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