Yesterday nodejs was updated in the bullseye point release,
making dh-nodejs in bullseye-backports no longer installable:
https://buildd.debian.org/status/fetch.php?pkg=swupdate&arch=arm64&ver=2022.12%2Bdfsg-4~bpo11%2B1&stamp=1682843746&raw=0
The following packages have unmet dependencies:
dh-nodejs : Depends: nodejs:any but it is not installable or
nodejs (< 12.22.5~dfsg-4~) but 12.22.12~dfsg-1~deb11u3 is to be installed
cu
Adrian