Update container version to v29

The new version reduces the size of the container by removing
unneeded pipewire dependencies and adds dbus.
This is needed to test vhost-device-sound.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>

.buildkite/autogenerate_pipeline.py

@@ -60,7 +60,7 @@
 
 # This represents the version of the rust-vmm-container used
 # for running the tests.
-CONTAINER_VERSION = "v28"
+CONTAINER_VERSION = "v29"
 # This represents the version of the Buildkite Docker plugin.
 DOCKER_PLUGIN_VERSION = "v5.3.0"