[20.10] update containerd binary v1.4.8

Update to containerd 1.4.8 to address [CVE-2021-32760][1].

[1]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32760

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.
-: "${CONTAINERD_COMMIT:=3194fb46e8311ae0eeae5a7a5843573adfebb16d}" # v1.4.7
+: "${CONTAINERD_COMMIT:=7eba5930496d9bbe375fdf71603e610ad737d2b2}" # v1.4.8
 
 install_containerd() (
 	echo "Install containerd version $CONTAINERD_COMMIT"