Update pypy
Update pypy

Changes:

- https://github.com/docker-library/pypy/commit/60e28bf: Merge pull request https://github.com/docker-library/pypy/pull/51 from infosiftr/pip-20
- https://github.com/docker-library/pypy/commit/9625e09: Pin pip to 20.x (the last version to support Python 2)
- https://github.com/docker-library/pypy/commit/0cedf2f: Update to 7.3.3, pip 20.3.3

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