Fix pyodide tests

[alcarney]

Description (e.g. "Related to ...", etc.)

This PR should fix the pyodide test suite - as well as bumping the version of pyodide we test to the latest.

The issue came down to dependency resolution... (something that I think has bitten us before?). The version of attrs available by default in pyodide was too old relative to the version of cattrs being selected by micropip.

(cattrs was attempting to import attrs.NothingType which was only introduced in attrs v24.3.0)

I would have assumed that the version bound on attrs supplied by cattrs itself would have been taken into account when installing pygls under pyodide but that does not seem to be the case.

So instead, I have added an explicit dependency on attrs to pygls itself, with a minimum version bound that ensures attrs.NothingType is always available

Code review checklist (for code reviewer to complete)

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Commit messages are meaningful (see this for details)
• Tests have been included and/or updated, as appropriate
• Docstrings have been included and/or updated, as appropriate
• Standalone docs have been updated accordingly

Automated linters

You can run the lints that are run on CI locally with:

poetry install --all-extras --with dev
poetry run poe lint

[alcarney]

Lint failure is just commitlint complaining about some of the urls I included in my commit message

footer's lines must not be longer than 100 characters [footer-max-line-length]

[alcarney]

Thanks!