[3006.x] Removing support for Python 3.7 and 3.8 from pre-commit

[dmurphy18]

What does this PR do?

Removes support for Python 3.7 and 3.8 from pre-commit and support in generated requirements for those versions of Python
Leaving support for Python 3.9 as this is required at the moment in order to build, that is, build tools/scripts/actions are currently making use of system python, for example: Rocky Linux 9 is using Python 3.9.

What issues does this PR fix or reference?

Fixes #67729

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

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Yes

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[dwoz]

I don't know what the rush is here. I would say we drop support for these older ones once they stop compiling properly. Though we don't support older versions of Python, people still use Salt on older platforms. The current requirements files we compile aren't really a huge overhead and don't hurt us, but would cause a lot of inconvenience to some of our users if they're removed.

I am not opposed to this but I also don't see a need to rush it.

[dmurphy18]

@dwoz 🤣 , Here is a link to a gChat from you telling me to make the PR and get it in from Feb 11th. https://chat.google.com/room/AAAA3ojQwho/WbUa0IBGrQk/WbUa0IBGrQk?cls=10