gitlab-ci.d/cirrus: Update the FreeBSD job to v14.3

gitlab-ci.d/cirrus: Update the FreeBSD job to v14.3

The FreeBSD 14.2 job fails since the image disappeared
from the cloud.  We already bumped FreeBSD image to 14.3
in tests/vm in c8958b7eb4 (part of v10.1.0).

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20251204205025.2423326-1-mjt@tls.msk.ru>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>