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

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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nosy: +vstinner
nosy_count: 11.0 -> 12.0
pull_requests: +26557
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/28116

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