Slotscheck

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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

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- Fix error when encountering metaclass with slots (106)
- Improved detection of immutable classes on Python 3.10+ (92)

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- Gracefully handle inspection failure due to
unimportable parent package (90).

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- Improved robustness of importing implicitly namespaced and
extension packages (64)

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- Improved robustness of determining whether a class is pure Python (65)

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- Add helpful link to 'failed to find module' message.