piuparts flags /etc/localtime as an unowned file

When I try to use piuparts in sbuild while building a Debian package, the piuparts run fails because it complaints that there's an unowned file /etc/localtime which my package definitely didn't create.

This is either a piuparts-on-Ubuntu bug, in that piuparts should exclude /etc/localtime from its checks, or it's a bug in whatever package creates /etc/localtime but doesn't take ownership of it as a conffile or something.

Your call. ;-)

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: piuparts 1.1.7
ProcVersionSignature: Ubuntu 6.5.0-5.5-generic 6.5.0
Uname: Linux 6.5.0-5-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.27.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 26 11:54:26 2023
InstallationDate: Installed on 2019-01-02 (1728 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
PackageArchitecture: all
SourcePackage: piuparts
UpgradeStatus: Upgraded to mantic on 2023-05-20 (129 days ago)