gitlab: update FreeBSD Cirrus CI image to 13.3

gitlab: update FreeBSD Cirrus CI image to 13.3

The 13.2 images have been deleted from gcloud

Cc: qemu-stable@nongnu.org
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240304144456.3825935-3-berrange@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 9ea920dc28254cd9a363aaef01985dffd8abedd7)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: 7.2 used FreeBSD version 13.1, not 13.2)