Update dependency jsonschema to v4.15.0

This MR contains the following updates:

Package	Update	Change
jsonschema (changelog)	minor	==4.14.0 -> ==4.15.0

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Release Notes

python-jsonschema/jsonschema

v4.15.0

Compare Source

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• A specific API Reference page is now present in the documentation.
• $ref on earlier drafts (specifically draft 7 and 6) has been "fixed" to follow the specified behavior when present alongside a sibling $id. Specifically the ID is now properly ignored, and references are resolved against whatever resolution scope was previously relevant.

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