Fix Safari runner initialization in selenium >= 4.20

[ryanking13]

Resolves #134. There was some breaking changes in DriverFinder class in selenium 4.20

• changelog

[hoodmane]

Thanks!

[hoodmane]

I wonder if there is a way for us to type annotate our additions to pytest rather than doing this. For instance, what about:

@dataclass
class PytestPyodideExtra:
   pyodide_dist_dir: str
   # ... other fields

def pytest_pyodide_extra() -> PytestPyodideExtra:
   return pytest.pytest_pyodide_extra

Also, shouldn't we be adding these extra fields to the pytest config object so they aren't globals? Seems like that would be a better design and make the test mocks simpler. Probably can leave this to a followup though.

[ryanking13]

I think we should not add attributes to pytest and instead manage those variables ourselves, such as:

SINGLETON_CONFIG = {...}

def get_config():
    return SINGLETON_CONFIG

##########

from pytest_pyodide import get_config
config = get_config()
print(config.pyodide_runtimes)

[ryanking13]

I removed Node 18 from the CI as it seems to fail in jspi tests.