[issue37689] Add Path.is_relative_to()

[hai shi]

Change by hai shi <shihai1991 at 126.com>:


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keywords: +patch
pull_requests: +14749
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/14982

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37689>
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