Python 3.8: asciinema atdtool aws-shell codemod docker-squash git-plus git-review howdoi s3cmd streamlink

[bayandin]

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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• asciinema, atdtool, aws-shell, codemod, docker-squash, git-plus, git-review, howdoi, s3cmd and streamlink are switched to python@3.8 and using virtualenv_install_with_resources for installation.
• asciinema, atdtool, docker-squash, git-plus and s3cmd: url changed from github to pypi (that's why brew audit compains)

Ref: #47274