2.15.0

Fixes for Debian Trixie (13) compatibility:

• backy2.config: replace deprecated/removed configparser usage
• backy2.meta_backends.sql_migrations.alembic.env: fix for SQLAlchemy 2.0
• backy2.io.lib.rados: fix 'is ""' string comparison

Full Changelog: v2.14.0...v2.15.0

2.14.0

Release 2.14.0