• #370: For the PostgreSQL hook, pass the "PGSSLMODE" environment variable through to Borg when the
  database's configuration omits the "ssl_mode" option.
• #818: Allow the "--repository" flag to match across multiple configuration files.
• #820: Fix broken repository detection in the "rcreate" action with Borg 1.4. The issue did not
  occur with other versions of Borg.
• #822: Fix broken escaping logic in the PostgreSQL hook's "pg_dump_command" option.
• SECURITY: Prevent additional shell injection attacks within the PostgreSQL hook.