deps: Drop support for python 3.9

[FBruzzesi]

Description

It's likely that I have missed some branches that could be simplified due to newer python and bumping upstream min versions. Take this as a start to discuss in more detail

What type of PR is this? (check all applicable)

• 💾 Refactor
• ✨ Feature
• 🐛 Bug Fix
• 🔧 Optimization
• 📝 Documentation
• ✅ Test
• 🐳 Other

Related issues

• Closes Drop support for Python 3.9 #3204

[FBruzzesi]

How would you feel about making the zip_strict -> zip(strict=True) change a follow-up?

Oh man, yes we can do that! In a way that's the largest diff 🤣

RE: typing, do you have any time/willing to take a stab at it?

[dangotbanned]

Thanks @FBruzzesi, really appreciate the slog you've gone through on this one 😍

As mentioned on discord, most of the suggestions are about this:

Current:

- zip(...)
+ zip(..., strict=True)

Proposed:

- zip(...)
+ zip(..., strict=False)

We can always make more of them strict later if needed 🙂

Note

zip_strict -> zip(..., strict=True) is all good

[FBruzzesi]

@MarcoGorelli let me know if you are happy with this.

I am happy to make a release before merging, so that some of the most recent features make it into a version that still support py3.9