Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/b818e94: Update to 3.7.7, pip 20.1
- https://github.com/docker-library/python/commit/4c386c7: Update to 3.8.2, pip 20.1
- https://github.com/docker-library/python/commit/06d7952: Update to 3.9.0a6, pip 20.1
- https://github.com/docker-library/python/commit/bbb44b3: Update to 3.6.10, pip 20.1
- https://github.com/docker-library/python/commit/37be883: Update to 3.5.9, pip 20.1
- https://github.com/docker-library/python/commit/7b869a3: Update to 3.9.0a6, pip 20.0.2

neo-technology/docker-official-images,docker-solr/official-images,infosiftr/stackbrew,31z4/official-images,31z4/official-images,docker-library/official-images,dinogun/official-images,31z4/official-images,thresheek/official-images,thresheek/official-images,thresheek/official-images,docker-solr/official-images,docker-library/official-images,docker-library/official-images,neo-technology/docker-official-images,docker-solr/official-images,31z4/official-images,thresheek/official-images,docker-solr/official-images,thresheek/official-images,infosiftr/stackbrew,31z4/official-images,neo-technology/docker-official-images,docker-library/official-images,docker-library/official-images,docker-solr/official-images,infosiftr/stackbrew,docker-solr/official-images,neo-technology/docker-official-images,neo-technology/docker-official-images,thresheek/official-images,infosiftr/stackbrew,infosiftr/stackbrew,docker-solr/official-images,docker-solr/official-images,dinogun/official-images,docker-solr/official-images,infosiftr/stackbrew,docker-solr/official-images,dinogun/official-images,dinogun/official-images,31z4/official-images,31z4/official-images,dinogun/official-images,thresheek/official-images,neo-technology/docker-official-images,31z4/official-images,neo-technology/docker-official-images,dinogun/official-images,31z4/official-images,dinogun/official-images,neo-technology/docker-official-images,docker-library/official-images,dinogun/official-images,infosiftr/stackbrew,31z4/official-images,31z4/official-images,dinogun/official-images,neo-technology/docker-official-images,docker-library/official-images,docker-solr/official-images,dinogun/official-images,docker-solr/official-images,docker-solr/official-images,infosiftr/stackbrew,neo-technology/docker-official-images,infosiftr/stackbrew,31z4/official-images,docker-library/official-images,docker-library/official-images,neo-technology/docker-official-images,docker-library/official-images,docker-library/official-images,dinogun/official-images,docker-solr/official-images,thresheek/official-images,neo-technology/docker-official-images,thresheek/official-images,infosiftr/stackbrew,thresheek/official-images,thresheek/official-images,infosiftr/stackbrew,31z4/official-images,thresheek/official-images,infosiftr/stackbrew,docker-library/official-images,docker-library/official-images,31z4/official-images,neo-technology/docker-official-images,dinogun/official-images,docker-library/official-images,infosiftr/stackbrew,neo-technology/docker-official-images,thresheek/official-images,thresheek/official-images,dinogun/official-images,infosiftr/stackbrew