Drop revoked certificate for Harald Hoyer

The certificate is revoked since nearly 5 years now. Drop it.

There are no signatures on other certificates by Harald, so no further
changes needed.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/20260129073111.931046-2-u.kleine-koenig@baylibre.com
Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>