Replace artifactory by minio for public repo

[hagenw]

Requires audeering/audbackend#231.

Adds support for S3 and MinIO backends, and switches the default repository to one hosted on AWS S3. It continues to support Artifactory backends.

Summary by Sourcery

Replace Artifactory with MinIO for public repositories, adding support for S3 and MinIO backends while maintaining compatibility with Artifactory.

New Features:

• Add support for S3 and MinIO backends.

Enhancements:

• Switch the default repository to one hosted on AWS S3.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR replaces Artifactory with MinIO/S3 as the default backend for public repositories. The implementation maintains backward compatibility with Artifactory while introducing S3 and MinIO support. The changes primarily involve updating repository configurations, backend handling, and test fixtures to use the new S3-based public repository.

Updated class diagram for Repository class

classDiagram
    class Repository {
        +FileSystem file-system
        +Minio minio
        +Artifactory artifactory
        +create_backend_interface() Type
    }
    note for Repository "Artifactory is included only if available in audbackend.backend"

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File-Level Changes

Change	Details	Files
Added support for MinIO/S3 backends and updated backend registry	Added MinIO backend to the backend registry Made Artifactory backend conditional based on availability Updated backend interface creation logic to handle different backend types	audb/core/repository.py
Updated repository configuration and constants	Added new constants for S3 public host and backend Updated default repository configuration to use MinIO backend Changed repository names from 'data-public' to 'audb-public'	tests/conftest.py audb/core/etc/audb.yaml
Modified database operations to handle S3/MinIO backend	Updated available() function to work with new backend Modified versions() function to handle backend-specific operations Updated example outputs to reflect new backend configuration	audb/core/api.py
Updated test fixtures and documentation	Modified repository fixtures to use new S3 backend Updated documentation strings to remove Artifactory-specific references Adjusted test configurations for private and public repositories	tests/conftest.py audb/core/conftest.py

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[sourcery-ai]

Hey @hagenw - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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