borgmatic 1.9.10

• #966: Add a "{credential ...}" syntax for loading systemd credentials into borgmatic
  configuration files. See the documentation for more information:
  https://torsion.org/borgmatic/docs/how-to/provide-your-passwords/
• #987: Fix a "list" action error when the "encryption_passcommand" option is set.
• #987: When both "encryption_passcommand" and "encryption_passphrase" are configured, prefer
  "encryption_passphrase" even if it's an empty value.
• #988: With the "max_duration" option or the "--max-duration" flag, run the archives and
  repository checks separately so they don't interfere with one another. Previously, borgmatic
  refused to run checks in this situation.
• #989: Fix the log message code to avoid using Python 3.10+ logging features. Now borgmatic will
  work with Python 3.9 again.
• Capture and delay any log records produced before logging is fully configured, so early log
  records don't get lost.
• Add support for Python 3.13.