[BUILD] Bump minimum required Python version to 3.9? about functime HOT 10 CLOSED

This makes sense 👍

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Should I make the PR?

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Let's do it. Also need to update the badges in the readme

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Finally time to get back to this. I am preparing a PR. One more thing: since we remove py3.8, we can rework a bit the type hints - no need to import List from typing, we can annotate with bare list. Can I work on those too? Should I create a separate PR for that? ruff can do quick work of those.

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@topher-lo I think I shall also open another PR to take care of the type annotations currently in place. As I was writing: "since we remove py3.8, we can rework a bit the type hints - no need to import List from typing, we can annotate with bare list". Do you agree with that?

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This would be a breaking change, so let's bundle this PR with 0.10.

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Why would you say it's a breaking change? It's the internal API. But sure!

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Also I forgot to update the badges in the README 😱 How do I generate it from shields.io?

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Users currently using 3.8 when they run pip upgrade functime, an error will occur

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Will postpone this until Py38 actually becomes unsupported (i.e., once 3.13 comes out). I think it's good to support the same Pyversions as polars does.

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