tests/functional/aarch64: Fix assets of test_hotplug_pci

The old bookworm URLs don't work anymore, resulting in a 404 error
now. Let's update the test to Debian Trixie to get it going again.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
1 file changed