Update pypy
Update pypy

Changes:

- https://github.com/docker-library/pypy/commit/ff2551f: Merge pull request https://github.com/docker-library/pypy/pull/63 from infosiftr/ensurepip
- https://github.com/docker-library/pypy/commit/7b773bc: Scrape PIP and setuptools versions directly from "ensurepip"

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