Update sonobuoy version to v0.56.16

The default K8s registry is changed to `registry.k8s.io`, the related
change is introduced since sonobuoy v0.56.8, upgrade its version to
the latest release v0.56.16 to avoid image pull failure.

Signed-off-by: Lan Luo <luola@vmware.com>

ci/run-k8s-e2e-tests.sh

@@ -43,7 +43,7 @@ THIS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 KUBE_CONFORMANCE_IMAGE_VERSION_OPTION=""
 IMAGE_PULL_POLICY="Always"
 CONFORMANCE_IMAGE_CONFIG_PATH="${THIS_DIR}/conformance-image-config.yaml"
-SONOBUOY_IMAGE="projects.registry.vmware.com/sonobuoy/sonobuoy:v0.56.4"
+SONOBUOY_IMAGE="projects.registry.vmware.com/sonobuoy/sonobuoy:v0.56.16"
 SYSTEMD_LOGS_IMAGE="projects.registry.vmware.com/sonobuoy/systemd-logs:v0.4"
 
 _usage="Usage: $0 [--e2e-conformance] [--e2e-network-policy] [--e2e-focus <TestRegex>] [--e2e-skip <SkipRegex>]

ci/verify-sonobuoy.sh

@@ -16,7 +16,7 @@
 
 _SONOBUOY_BINDIR="/tmp/antrea"
 _SONOBUOY_TARBALL="/tmp/sonobuoy.tar.gz"
-_MIN_SONOBUOY_VERSION="v0.56.4"
+_MIN_SONOBUOY_VERSION="v0.56.16"
 
 install_sonobuoy() {
     local ostype=""