devel/py-b2sdk: Update to 2.9.4

Changes since 2.8.1:

• Adapt authorize_account flow to multi-bucket keys.
• Migrate to b2 native api v4.
• Move url_for_api func to an internal classmethod in B2Api class.
• Release apiver v3 interface. from b2sdk.v3 import ... is now the recommended import, but previous versions are still supported.
• Update application key classes to support multiple bucket ids.
• Update create_key flow to multi-bucket keys.
• Fix incorrect reliance on v3 abstractions in apiver v2.
• Fix B2HttpApiConfig and Services references in exposed v2 API.
• Fix broken StubAccountInfo.list_bucket_names_ids().
• Fix bucket name mapping in RawSimulator.authorize_account().
• Fix incorrect path check in LocalFolder.make_full_path.

PR: 287123
Approved by: PopularMoment@protonmail.com (maintainer)