Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/762c765: Merge pull request https://github.com/docker-library/python/pull/442 from J0WI/alpine11
- https://github.com/docker-library/python/commit/d6a0035: Adjust generate-stackbrew-library.sh
- https://github.com/docker-library/python/commit/ba80ba5: Add --no-network
- https://github.com/docker-library/python/commit/024062f: Add Alpine 3.11

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