The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In debian/watch no matching files for watch line http://packages.linuxmint.com/pool/backport/n/nemo-fileroller/ nemo-fileroller_([\d.]+)%2b[\w\d]+(?i)(?:\.(?:tar\.xz|tar\.bz2|tar\.gz|tar\.zstd?|zip|tgz|tbz|txz))