Base image of Dockerfile python:3.8.1-alpine3.11 contains vulnerable libraries

[mirraxian]

• I've read the contribution guidelines and agree with them

I've found a bug and checked that ...

• ... the problem doesn't occur with the default MkDocs template
• ... the problem is not in any of my customizations (CSS, JS, template)
• ... the documentation does not mention anything about my problem
• ... there are no open or closed issues that are related to my problem

Description

Docker image is currently based on python:3.8.1-alpine3.11 which contains outdated packages such as sqlite 3.32.1-r0 which suffers from CVE-2020-11656.

[mirraxian]

Pull Request 2252 submitted with updated python base image.

mkdocs build and mkdocs gh-deploy validated:

/docs # mkdocs build
INFO    -  Cleaning site directory
INFO    -  Building documentation to directory: /docs/site
INFO    -  Documentation built in 9.34 seconds
/docs # mkdocs gh-deploy
INFO    -  Cleaning site directory
INFO    -  Building documentation to directory: /docs/site
INFO    -  Documentation built in 6.81 seconds
WARNING -  Version check skipped: No version specified in previous deployment.
INFO    -  Copying '/docs/site' to 'gh-pages' branch and pushing to GitHub.
INFO    -  Your documentation should shortly be available at: https://BenHimsel.github.io/mkdocs-material/

[squidfunk]

Fixed in #2252

[squidfunk]

Released as 6.2.7.