[issue38662] Decouple ensurepip from pip's internals using runpy

[Miro Hrončok]

Change by Miro Hrončok <miro at hroncok.cz>:


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nosy: +hroncok
nosy_count: 7.0 -> 8.0
pull_requests: +18259
pull_request: https://github.com/python/cpython/pull/18901

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38662>
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