Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/35d8d97: Update to 3.7.9, pip 20.2.3
- https://github.com/docker-library/python/commit/554274e: Update to 3.6.12, pip 20.2.3
- https://github.com/docker-library/python/commit/9ff5f04: Update to 3.8.5, pip 20.2.3
- https://github.com/docker-library/python/commit/0757617: Update to 3.9.0rc1, pip 20.2.3
- https://github.com/docker-library/python/commit/c85a8c6: Update to 3.5.10, pip 20.2.3
- https://github.com/docker-library/python/commit/6e97890: Update to 3.5.10, pip 20.2.2

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