Check latest Python beta against Texual

[willmcgugan]

• Check test suite against 3.11 latest beta
• Check sandbox demos known to run
• Fix or ticket any minor issues

[darrenburns]

aiohttp doesn't build on 3.11.0-beta4 due to a direct dependency frozenlist not yet building on it, which, apparently is due to Cython not yet building on it (https://github.com/aio-libs/frozenlist/issues/305).

aiohttp is required for devtools and for pytest-aiohttp, so we can't yet run tests or devtools, and actually we aren't able to install Textual at all since the dependency process bombs out.

I'm going to block this issue while upstream issues get worked out rather than building a bunch of 3.11 specific workarounds. I suspect that since the issues are related to very popular dependencies they will be resolve.

We can revisit in the near future.

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