SystemGroup stopped supporting spaces in a recent version

[darkpixel]

See bug #5041

For years we've had cups-based Linux print servers with a setting:
SystemGroup "Printer Administrators"

After upgrading from Debian 12 (Bookwork) running cups 2.4.2-3+deb12u9 to Debian 13 (Trixie) running cups 2.4.10-3+deb13u1, that setting prevents cups from running.

Replacing it with SystemGroup "printer-administrators" works, but will require us to change groups on hundreds of networks.