Actually APT pinning should be handled silent, hence you shouldn’t see anywhere a hint about those packages, at least when I tested last. But just to test it:
apt update
apt upgrade
mv /etc/apt/{preferences.d/,}dietpi-lxde
# For the next command it is important that you do NOT confirm the upgrade. It would break your LXDE desktop.
# This is just to see whether there are offered as well 2 package upgrades
apt upgrade
# Move the pinning back in place
mv /etc/apt/{,preferences.d/}dietpi-lxde
# apt upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
# mv /etc/apt/{preferences.d/,}dietpi-lxde
# apt upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
libkeybinder0 libwnck-common libwnck22
Use 'apt autoremove' to remove them.
The following NEW packages will be installed:
eject libkeybinder-3.0-0 xinput
The following packages will be upgraded:
libfm-data libfm-extra4 libfm-gtk-data libfm-gtk4 libfm-modules libfm4
libgail-3-0 libgtk-3-0 libgtk-3-common libgtk2.0-0 libgtk2.0-common
libobrender32v5 libobt2v5 lxinput lxlock lxpanel lxpanel-data lxpolkit
lxsession lxsession-data lxsession-edit lxsession-logout lxterminal openbox
pcmanfm
25 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 14.0 MB of archives.
After this operation, 524 kB of additional disk space will be used.
Do you want to continue? [Y/n] n
Abort.
# mv /etc/apt/{,preferences.d/}dietpi-lxde