Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/4f369cb: Update to 3.8.9, pip 21.1.1
- https://github.com/docker-library/python/commit/85243ed: Update to 3.10.0a7, pip 21.1.1
- https://github.com/docker-library/python/commit/f603cd7: Update to 3.9.4, pip 21.1.1
- https://github.com/docker-library/python/commit/117d4e3: Update to 3.7.10, pip 21.1.1
- https://github.com/docker-library/python/commit/7f89b45: Update to 3.6.13, pip 21.1.1

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