fix: bump learning-core to 0.30.2 [ulmo]

[dwong2708]

Backport of #37729

This pulls in backup and restore changes from:

openedx/openedx-learning#448

It involves adding the missing author value when restoring a backup ZIP file.

[openedx-webhooks]

Thanks for the pull request, @dwong2708!

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[ormsbee]

This does not seem like something that should come as part of this backport.