Use ruff for linting

[WhyNotHugo]

Use ruff instead of flake8+isort+pyupgrade+pygrep-hooks. This change configures ruff to apply all the same rules that these tools apply.

I've omitted E501 for now since there are a few violations.

[WhyNotHugo]

My intent is to enable a few extra rules, but I've purposefully limited this initial patch to apply the same rules as before.

[matthiask]

Two minor points:

• My experience is better when running ruff before black.
• Is there a reason why you added ruff to requirements_dev.txt? I don't think it's necessary? Pruning flake8 and isort looks like the right thing to do anway, that has probably been forgotten when we switched to pre-commit.

Apart from that I'm very happy with ruff, and I agree with this

[WhyNotHugo]

My experience is better when running ruff before black.

I think that makes sense, I've inverted the order.

Is there a reason why you added ruff to requirements_dev.txt? I don't think it's necessary? Pruning flake8 and isort looks like the right thing to do anway, that has probably been forgotten when we switched to pre-commit.

It was mostly to stay in line with the existing requirements. I'll go ahead and drop it; I think it's sane to expect that developers have this installed already (or know how to install it).

[tim-schilling]

It's probably worth dropping a line in the changes.rst file about this too.

[WhyNotHugo]

It's probably worth dropping a line in the changes.rst file about this too.

This really doesn't have any user-facing changes, I'm not sure what to mention for this.