Dear Maintainer,

In version 5.0.0-1, the conffile /etc/openmpi/openmpi-default-hostfile was
dropped from openmpi-bin.

However, the obsolete conffile is not properly cleant up during the upgrade
(e.g. from bookworm to trixie):

$ adequate openmpi-bin
openmpi-bin: obsolete-conffile /etc/openmpi/openmpi-default-hostfile
$ dpkg-query -W -f='${Conffiles}\n' openmpi-bin | grep obsolete$
 /etc/openmpi/openmpi-default-hostfile ef9b3fad0bd8bcb7bdbafe1881f068d3 obsolete

Please use the dpkg-maintscript-helper support provided by
dh_installdeb to remove this obsolete conffile on upgrade.

https://www.debian.org/doc/debian-policy/ch-files.html#s-config-files
https://manpages.debian.org/man/1/dh_installdeb

Thanks for your work,