Update dependency jsonschema to v4.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
jsonschema (changelog)	==4.10.2 -> ==4.12.1

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Release Notes

python-jsonschema/jsonschema

v4.12.1

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• Fix some stray comments in the README.

v4.12.0

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• Warn at runtime when subclassing validator classes. Doing so was not
  intended to be public API, though it seems some downstream libraries
  do so. A future version will make this an error, as it is brittle and
  better served by composing validator objects instead. Feel free to reach
  out if there are any cases where changing existing code seems difficult
  and I can try to provide guidance.

v4.11.0

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• Make the rendered README in PyPI simpler and fancier. Thanks Hynek (#​983)!

v4.10.3

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• jsonschema.validators.validator_for now properly uses the explicitly
  provided default validator even if the $schema URI is not found.

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