Slotscheck

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- Don't flag ``TypedDict`` from ``typing_extensions`` in Python versions
where ``typing`` has ``TypedDict`` itself.

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- Remove ``tomli`` dependency on Python 3.11+

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- Fix broken ``Protocol`` import due to absent ``typing_extensions``
on Python <3.10.

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- Don't flag ``Protocol`` classes as needing slots if strict
``require-subclass`` option is enabled.

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- Don't flag ``TypedDict`` subclasses as missing slots (120).

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**Breaking changes**

- The "strict-imports" default value was mistakenly ``False`` in contrast to what is documented.
The default value is now ``True``, in line with documentation.
If you were relying on this permissive import behavior,
you will need to set this option in the CLI or settings file.
- Drop Python 3.6 support

**Bugfixes**

- Disabling "strict-imports" now also gracefully handles failed imports
of the root module given (113).

**Features**

- Add official Python 3.11 support