Mantic ubuntu-core-initramfs depmod warnings

mantic generic amd64 builds produce the following warning

```console
depmod: WARNING: could not open modules.builtin.modinfo at /tmp/tmpgli9l1hl.ubuntu-core-initramfs/main/lib/modules/6.3.0-7-generic: No such file or directory
```

Maybe this means some new additional libkmod file from the kernel build is not copied over into the initrd?