Broken APT installation with udev

Got this when trying to fix an APT tree using `sudo apt install -f`:
```
Preparing to unpack .../udev_247.3-7+deb11u1_amd64.deb ...
Since release 198, udev requires support for the following features in
the running kernel:

- inotify(2)            (CONFIG_INOTIFY_USER)
- signalfd(2)           (CONFIG_SIGNALFD)
- accept4(2)
- open_by_handle_at(2)  (CONFIG_FHANDLE)
- timerfd_create(2)     (CONFIG_TIMERFD)
- epoll_create(2)       (CONFIG_EPOLL)
dpkg: error processing archive /var/cache/apt/archives/udev_247.3-7+deb11u1_amd64.deb (--unpack):
 new udev package pre-installation script subprocess returned error exit status 1
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Errors were encountered while processing:
 /var/cache/apt/archives/udev_247.3-7+deb11u1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
```

`sudo dpkg --configure -a` does NOT help.

Remove the `Package: systemd` from `/var/lib/dpkg/status` did NOT help.

`sudo dpkg --remove --force-remove-reinstreq systemd-timesyncd` and then `sudo dpkg --remove --force-remove-reinstreq systemd` allows to do a `sudo apt autoremove`.

It seems like systemd needed udev, but systemd was to be removed, so that version of udev was not actually necessary.