feat(licenses): Adding Creative Commons Zero to the list of approved …

[troed]

…licenses

• Resolves: # Unable to release my app due to too permissive license appstore#1746

Summary

Adds Creative Commons Zero (CC0-1.0) to the list of the approved licenses. This is the server part of the PR, there's an accompanying one placed on the appstore repo as well.

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[edward-ly]

Thanks for this! Same comments from the appstore PR: I would prefer to keep the list organized in alphabetical order.

Also, when you update the branch, please squash and rebase it so that it starts from the current tip of the master branch.

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

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