contrib: debian: switch to dh-sequence-dkms

Follows b191f9a13d3005621ead9a727b811892264505ef from Debian's
packaging team at:
https://salsa.debian.org/zfsonlinux-team/zfs/

The previous build-dependency is kept as option, to still be able to
build on older Debian based distros (e.g. Ubuntu 20.04).

Without this building on Debian 12/bookworm does not work, as `dkms`
is a virtual package.

Reviewed-by: Umer Saleem <usaleem@ixsystems.com>
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Closes openzfs#15304

contrib/debian/control

@@ -4,7 +4,7 @@ Priority: optional
 Maintainer: ZFS on Linux specific mailing list <zfs-discuss@list.zfsonlinux.org>
 Build-Depends: debhelper-compat (= 12),
                dh-python,
-               dkms (>> 2.1.1.2-5),
+               dh-sequence-dkms | dkms (>> 2.1.1.2-5),
                libaio-dev,
                libblkid-dev,
                libcurl4-openssl-dev,