chore: update content libraries opaque key usages for opaque-keys v3

[bradenmacdonald]

This PR makes the corresponding changes for compatibility with openedx/opaque-keys#379

Not ready for merge: needs an opaque-keys version bump first.

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[ormsbee]

Aside from the version bump, LGTM.

[bradenmacdonald]

Yup, will fix that before merging. Thanks!

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2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.