Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/13ae0c0: Merge pull request https://github.com/docker-library/python/pull/405 from J0WI/buster
- https://github.com/docker-library/python/commit/2a11f61: Add Debian Buster and remove Jessie
- https://github.com/docker-library/python/commit/a12a97a: Merge pull request https://github.com/docker-library/python/pull/404 from infosiftr/enable-optimizations
- https://github.com/docker-library/python/commit/f82205c: Add "--enable-optimizations" (and a slimmer PROFILE_TASK than the default of "run all tests")
- https://github.com/docker-library/python/commit/ccbc1f5: Remove Python 3.6 for Windows

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