Merge pull request #46031 from thaJeztah/20.10_backport_bump_runc_binary_1.1.8

[20.10 backport] Dockerfile: update runc binary to v1.1.8

hack/dockerfile/install/runc.installer

@@ -9,7 +9,7 @@ set -e
 # the containerd project first, and update both after that is merged.
 #
 # When updating RUNC_VERSION, consider updating runc in vendor.conf accordingly
-: "${RUNC_VERSION:=v1.1.7}"
+: "${RUNC_VERSION:=v1.1.8}"
 
 install_runc() {
 	RUNC_BUILDTAGS="${RUNC_BUILDTAGS:-"seccomp"}"