cadaver-0.23.3-0: Remove old version (use rclone instead)

The currently installed version does not work anymore:

    $ cadaver https://nc.molgen.mpg.de:443/cloud/remote.php/dav/files/pmenzel/
    Segmentation fault (core dumped)

cadaver is still actively developed [1], and version 0.26 was released
in November 2024. But, as we have rclone now, remove cadaver instead of
updating it.

[1]: https://github.com/notroj/cadaver