refactor: comply to more ruff and pyright rules

[cmp0xff]

• This also removes reportUnusedVariable errors in the pyright strict test
• Closes df.drop signature does not capture all constraints #950: fixes a remaining issue in test_arguments_drop from there

[Dr-Irv]

If it's the case that this makes reportUnusedVariable go away in strict, then you can delete the line in pyproject.toml that refers to it.

[cmp0xff]

The changes are bigger now because two pyright rules are dropped

[Dr-Irv]

thanks @cmp0xff

Seems like most of the changes are moving from 3.9 compliant code to 3.10. Did you use a tool to make that easier to do?

[cmp0xff]

Seems like most of the changes are moving from 3.9 compliant code to 3.10. Did you use a tool to make that easier to do?

Hi @Dr-Irv, I used regex to replace in one case, otherwise I used a brute-force approach.