[issue40360] Deprecate lib2to3 (and 2to3) for future removal

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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pull_requests: +20841
pull_request: https://github.com/python/cpython/pull/21697

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40360>
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