databento 0.75.0

Release notes

Enhancements

• Upgraded databento-dbn to 0.53.0:
  • Made ts_out a permanent field on all Python record types, replacing the
    dynamic __dict__ attribute. ts_out returns an int (UNDEF_TIMESTAMP when
    not set)
  • Removed __dict__ from all Python record classes, eliminating a separate
    per-instance allocation