uspot: update to Git HEAD (2024-03-25)

uspot: update to Git HEAD (2024-03-25)

56eebdad085e uspot: wrap spotfilter device under tip_mode
1a96d57e5fe0 uspot: client_enable() wrap spotfilter data in tip_mode
fe12f9a7abde uspot: clear ratelimit state on startup/shutdown
976badc4d0b6 update README
53b8cb88a94a Makefile: require minimum ucode version
ff6163190d5a uspot/portal: report client_enable() failure
8601d9199233 include sample radcli dictionaries
c670f6c4b48f update README
094f0df88150 uspot: work around ucode#191 missing in 23.05

Update the package Makefile to reflect the changes from the following
above-listed commit:

53b8cb88a94a Makefile: require minimum ucode version

Fixes: https://github.com/f00b4r0/uspot/issues/4
Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
(cherry picked from commit bc33522715342e04461000fc119ec71df12514a1)