Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/77bc1b0: Bump default alpine version to 3.13
- https://github.com/docker-library/python/commit/4b499d6: Merge pull request https://github.com/docker-library/python/pull/574 from cschramm/alpine3.13
- https://github.com/docker-library/python/commit/e8674e6: Drop alpine 3.11, update generate-stackbrew-library.sh for alpine 3.13
- https://github.com/docker-library/python/commit/f550db0: Add alpine3.13
- https://github.com/docker-library/python/commit/903be32: Update to 3.10.0a5, pip 21.0.1

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