buildkite: Use latest 4.9 kernel

The 4.9.0-9 kernel is no longer available. That breaks our CI as it no
longer allows us to run the bzImage tests.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Author: Samuel Ortiz

.buildkite/hooks/post-checkout

@@ -1,12 +1,12 @@
 #!/bin/bash
 
-DEB_NAME="linux-image-4.9.0-9-amd64_4.9.168-1_amd64.deb"
+DEB_NAME="linux-image-4.9.0-11-amd64_4.9.189-3_amd64.deb"
 DEB_URL="http://ftp.debian.org/debian/pool/main/l/linux/${DEB_NAME}"
 
 REPO_PATH="${BUILDKITE_BUILD_CHECKOUT_PATH}"
 DEB_PATH="${REPO_PATH}/${DEB_NAME}"
 EXTRACT_PATH="${REPO_PATH}/src/bzimage-archive"
-BZIMAGE_PATH="${EXTRACT_PATH}/boot/vmlinuz-4.9.0-9-amd64"
+BZIMAGE_PATH="${EXTRACT_PATH}/boot/vmlinuz-4.9.0-11-amd64"
 
 mkdir -p ${EXTRACT_PATH}