updates pydantic to resolve #221

[kammoh]

update pydantic (and other dependencies, including test, doc, dev, etc)

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

Fixes #221

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
• CONTRIBUTORS.md was updated, as appropriate
• Changelog has been updated, as needed (see CHANGELOG.md)

[perrinjerome]

This generally looks good ( this is also what I felt in #148 (comment) )

I left a few remarks, I don't know if it's OK for me to click approve, I'm just an external contributor

[alcarney]

I think websockets 10.x drops support for Python 3.6, (see this comment) this might have to stay on 9.x for now

[arwedus]

maybe it's okay to drop 3.6 support as well for pygls? Would be cool to see this PR get forward.

[alcarney]

Perhaps, though I think that call probably lies with @danixeee or @dgreisen

[Bobronium]

Is it necessary to update websockets to support python 3.10?

If not, I'd propose doing it in a separate PR, while merging this first to address compatibility issues.

Then we can reason about whether dropping python3.6 is a good idea.