Change the Python version of Homebrew

Homebrew's Python has become Python 3.9 before I knew it

When the brew update comes in, Python will automatically become 3.9. Python 3.9 is inconvenient because there are some new and unsupported packages, so I will revert to Python 3.8.

Python 3.8 and 3.9 are treated differently in Homebrew, so you can undo them by changing the link.

$ brew unlink [email protected]
$ brew link [email protected]

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