Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/3957597: Update to 3.9.0a2, pip 19.3.1
- https://github.com/docker-library/python/commit/5f1e3cb: Update to 3.7.6, pip 19.3.1
- https://github.com/docker-library/python/commit/4b59d07: Update to 3.6.10, pip 19.3.1
- https://github.com/docker-library/python/commit/32b69d6: Update to 3.8.1, pip 19.3.1
- https://github.com/docker-library/python/commit/d188118: Merge pull request https://github.com/docker-library/python/pull/440 from infosiftr/enable-caveman-optimizations
- https://github.com/docker-library/python/commit/43fe04f: Add "--enable-optimizations" on Python 2.7

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