Check pre-commit ruff formatting for notebooks is set up correctly

[drbenvincent]

I'm not 100% sure the pre-commit checks are fully/properly working for ruff formatting of notebooks. Currently we have:

CausalPy/.pre-commit-config.yaml

Lines 26 to 35 in 9a4daf7

	- repo: https://github.com/astral-sh/ruff-pre-commit
	rev: v0.4.3
	hooks:
	- id: ruff
	args: ["--fix", "--output-format=full"]
	- id: ruff-format
	- repo: https://github.com/nbQA-dev/nbQA
	rev: 1.8.5
	hooks:
	- id: nbqa-ruff

Maybe we don't need nbQA at all and solely use ruff-pre-commit? The README at https://github.com/astral-sh/ruff-pre-commit shows that it's pretty simple to make it apply to Jupyter notebooks.

[OriolAbril]

It is not necessary to use nbqa, the latest ruff pre-commit hooks support jupyter and pyi files directly. The third code block shows how: https://github.com/astral-sh/ruff-pre-commit