[issue42269] Add ability to set __slots__ in dataclasses

[Yurii Karabas]

Change by Yurii Karabas <1998uriyyo at gmail.com>:


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keywords: +patch
nosy: +uriyyo
nosy_count: 5.0 -> 6.0
pull_requests: +22998
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24171

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42269>
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