ghc@8.8: migrate to python@3.8

[Rylan12]

• 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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[jonchang]

@Bo98 do these need to build dependents from source?

didnt build dependents from source

[Bo98]

For a pull request like this which only changes a build time dependency and should have no effect on how it behaves at runtime, it should be fine.

I believe Python is only used here for docs and tests.

[iMichka]

Yes, we do not need to bump the revision here, as this is just a build time dependency. @Rylan12 can you remove the revision 1 line?

[Rylan12]

Yep! Thanks for the catch @jonchang.