Release v1.8.0

• Added: support for publishing tables as parquet files
• Changed: depend on audeer >=2.1.0
• Changed: depend on audformat >=1.2.0
• Changed: depend on pandas >=2.1.0
• Fixed: update progress bar at least every second
  in audb.load(),
  audb.load_attachment(),
  audb.load_media(),
  audb.load_tables(),
  audb.load_to(),
  audb.publish()
• Removed: support for Python 3.8