ci: retry Pyodide tests

[tombh]

This is to get around a curious issue that isn't resolved by dependency locking. The flakey error is:

ImportError: cannot import name 'Any' from 'typing_extensions'

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

[alcarney]

Sorry, I keep meaning to look into this.

Looking at things more closely, I think the pip install step based on a locked set of dependencies that was added in 476eaf1 should probably be moved to here

Aside from the selenium stuff, run.py only needs to package pygls plus it’s test suite into a wheel so that it can be pushed inside the pyodide runtime where the tests are actually run. It’s this "hidden" pip install step inside the runtime itself that is causing the issue and needs some help picking the right version of everything.

[alcarney]

This looks like a great workaround for the meantime though 😄

[tombh]

Ahh, yes that makes sense, it's the Pyodide runtime that needs the pinned deps. So there's still a chance 😀

But no rush, this PR should get us by.