update Python minimum version to 3.8

[sdebruyn]

What are you changing in this pull request and why?

Docs change for PR dbt-labs/dbt-core#7623 / issue dbt-labs/dbt-core#7082

resolves #3368

Checklist

• Add versioning components, as described in Versioning Docs
• Add a note to the prerelease version Migration Guide
• Review the Content style guide and About versioning so my content adheres to these guidelines.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

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[dbeatty10]

Thanks for raising this PR @sdebruyn !

This review has a couple suggestions that I will commit in a moment.

[dbeatty10]

We haven't made a drop-down menu item for the 1.6 version of the docs yet, but I confirmed in the preview that it didn't create problems to include this ahead of time so it is ready when the time comes.

https://deploy-preview-3369--docs-getdbt-com.netlify.app/faqs/core/install-python-compatibility?version=1.6

Could you be extra confirmation @mirnawong1 ?

[sdebruyn]

Thanks for raising this PR @sdebruyn !

This review has a couple suggestions that I will commit in a moment.

Sorry, looks like I wasn't wearing my glasses while typing those 3.8s 😂

[mirnawong1]

This is awesome, thank you for opening this up @sdebruyn and for looking it over @dbeatty10 ! I made some small tweaks because the linked text wasn't rendering correctly due to spacing (see screenshot) but it looks great now! confirm the drop down works fine and doesn't harm the user experience. approved on my end, wdyt @dbeatty10 ?

[dbeatty10]

Looks great to meet @mirnawong1 -- squashing and merging.