GitHub Actions: 3.10-dev --> 3.11-dev

[cclauss]

"3.10" # Without quotes YAML treats this as 3.1 as discussed in https://dev.to/hugovk/the-python-3-1-problem-85g

[GrahamDumpleton]

Python 3.11 breaks on tests so not practical to add it to testing at this point. Python 3.11 is possibly too unstable at this point.

Traceback (most recent call last):
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/py/_vendored_packages/apipkg/__init__.py", line 145, in __makeattr
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    modpath, attrname = self.__map__[name]
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                        ~~~~~~~~~~~~^^^^^^
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KeyError: '__spec__'
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During handling of the above exception, another exception occurred:
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Traceback (most recent call last):
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/runpy.py", line 187, in _run_module_as_main
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    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
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                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/runpy.py", line 146, in _get_module_details
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    return _get_module_details(pkg_main_name, error)
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           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/runpy.py", line 110, in _get_module_details
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    __import__(pkg_name)
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    ^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/tox/__init__.py", line 32, in <module>
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    from .session import cmdline  # isort:skip
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    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/tox/session/__init__.py", line 20, in <module>
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    from tox import reporter
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    ^^^^^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/tox/reporter.py", line 127, in <module>
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    _INSTANCE = Reporter()
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                ^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/tox/reporter.py", line 32, in __init__
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    self._reset(**kwargs)
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    ^^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/tox/reporter.py", line 38, in _reset
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    self.tw = py.io.TerminalWriter()
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              ^^^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/py/_vendored_packages/apipkg/__init__.py", line 152, in __makeattr
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    result = importobj(modpath, attrname)
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             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/py/_vendored_packages/apipkg/__init__.py", line 72, in importobj
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    module = __import__(modpath, None, None, ['__doc__'])
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             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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  File "<frozen importlib._bootstrap>", line 1044, in _find_and_load
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  File "<frozen importlib._bootstrap>", line 1004, in _find_and_load_unlocked
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  File "/opt/hostedtoolcache/Python/3.11.0-alpha.1/x64/lib/python3.11/site-packages/py/_vendored_packages/apipkg/__init__.py", line 150, in __makeattr
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    raise AttributeError(name)
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    ^^^^^^^^^^^^^^^^^^^^^^^^^^
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AttributeError: __spec__