Pin ckzg

[kclowes]

What was wrong?

Core tests are failing because of a ckzg update.

How was it fixed?

Pinned ckzg to <2.0 for now, since that's when the fails started.

Todo:

• [x] Clean up commit history
• [x] Add or update documentation related to these changes
• [x] Add entry to the release notes

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