Feature/wrap socket

[leon1995]

Changes

Fixes #845

Checklist

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- Fix big bad boo-boo in task groups
  (`#123 <https://github.com/agronholm/anyio/issues/123>`_; PR by @yourgithubaccount)

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[leon1995]

I dont know why mypy is complaining here because I just copied the call from the connted_tcp method (and swapped the parameters for the socket)