update containerd binary to v1.4.3 (CVE-2020-15257)

full diff: https://github.com/containerd/containerd/compare/v1.4.2...v1.4.3

Release notes:

Welcome to the v1.4.3 release of containerd!

The third patch release for containerd 1.4 is a security release to
address CVE-2020-15257. See GHSA-36xw-fx78-c5r4 for more details:

https://github.com/containerd/containerd/security/advisories/GHSA-36xw-fx78-c5r4

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

hack/dockerfile/install/containerd.installer

@@ -4,7 +4,7 @@ set -e
 # containerd is also pinned in vendor.conf. When updating the binary
 # version you may also need to update the vendor version to pick up bug
 # fixes or new APIs.
-: "${CONTAINERD_COMMIT:=b321d358e6eef9c82fa3f3bb8826dca3724c58c6}" # v1.4.2
+: "${CONTAINERD_COMMIT:=269548fa27e0089a8b8278fc4fc781d7f65a939b}" # v1.4.3
 
 install_containerd() (
 	echo "Install containerd version $CONTAINERD_COMMIT"