running on LTS shouldn't warn because the devel branch can't be determined by distro-info

Running on 22.04.3 LTS, specifically package version 2.8ubuntu1.

The unattended-upgrades.log is full of
    WARNING Could not figure out development release: Distribution data outdated. Please
    check for an update for distro-info-data. See /usr/share/doc/distro-info-data/README.Debian
    for details.

The note in README.Debian boils down to "make sure -updates is in sources.list", which it already is.

This warning is triggered by the Unattended-Upgrade::DevRelease setting in /etc/apt/50unattended-upgrades being set to auto (the default). The code in /usr/bin/unattended-upgrades then calls distro_info.UbuntuDistroInfo().devel() which then throws a DistroDataOutdated.

(I don't know *why* it's throwing that, as...

$ distro-info --devel
noble

...but that's neither here nor there for purposes of this bug report.)

Can the "Unattended-Upgrade::DevRelease == auto" code path be made a little smarter for LTS releases? Testing "if currently running LTS then we're definitely not 'devel' in any case, so it doesn't matter how recent the distro-data file is, don't even bother checking it" seems reasonable. Or possibly 'Unattended-Upgrade::DevRelease' should default to false on LTS releases, although I appreciate that changing the default conffiles based on LTS-or-not can easily lead to some surprises.