Add repositories argument to audb.available()

[hagenw]

Add repositories argument to audb.available() to be able to limit the repositories, in which it should search. Before, a user needed to modify audb.confg.REPOSITORIES before calling audb.available() to limit its output to certain repositories.

Summary by Sourcery

Add a 'repositories' argument to the audb.available() function to enable users to limit the search to specified repositories, enhancing the function's flexibility and usability.

New Features:

• Introduce a 'repositories' argument to the audb.available() function, allowing users to specify which repositories to search.

Tests:

• Add tests for the new 'repositories' argument in audb.available(), including scenarios for all repositories and single repository searches.

[hagenw]

@sourcery-ai review

[sourcery-ai]

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

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟡 Testing: 1 issue found
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[ChristianGeng]

All the issues that I had
(typing related and a more explicit docstring) are settled.

Proceeding with approval.