Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/34b15c3: Update to 3.10.0b4, pip 21.2.2
- https://github.com/docker-library/python/commit/d18aeb0: Update to 3.9.6, pip 21.2.2
- https://github.com/docker-library/python/commit/1a28e12: Update to 3.6.14, pip 21.2.2
- https://github.com/docker-library/python/commit/4a6ad28: Update to 3.7.11, pip 21.2.2
- https://github.com/docker-library/python/commit/7378e60: Update to 3.8.11, pip 21.2.2

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