fix: bump learning-core to 0.30.2

[dwong2708]

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]

Did this get auto-generated?

[dwong2708]

It did after running the make compile-requirements command; otherwise, the CI was complaining.
The weird thing is that others were able to merge without this change.
From what I understand, this common_constraints.txt file is modified by the mentioned command, and based on the configuration defined here: https://github.com/openedx/edx-platform/blob/master/requirements/pip-tools.txt#L23

[dwong2708]

I think it is good to merge now @ormsbee