vendor: bump runc to rc94

One notable change is cgroup manager's Set now accept Resources rather
than Cgroup (see https://github.com/opencontainers/runc/pull/2906).
Modify the code accordingly.

Also update runc dependencies (as hinted by hack/lint-depdendencies.sh):

	github.com/cilium/ebpf v0.5.0
	github.com/containerd/console v1.0.2
	github.com/coreos/go-systemd/v22 v22.3.1
	github.com/godbus/dbus/v5 v5.0.4
	github.com/moby/sys/mountinfo v0.4.1
	golang.org/x/sys v0.0.0-20210426230700-d19ff857e887
	github.com/google/go-cmp v0.5.4
	github.com/kr/pretty v0.2.1
	github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

vendor/github.com/opencontainers/runc/libcontainer/system/unsupported.go

@@ -1,27 +0,0 @@
-// +build !linux
-
-package system
-
-import (
-	"os"
-
-	"github.com/opencontainers/runc/libcontainer/user"
-)
-
-// RunningInUserNS is a stub for non-Linux systems
-// Always returns false
-func RunningInUserNS() bool {
-	return false
-}
-
-// UIDMapInUserNS is a stub for non-Linux systems
-// Always returns false
-func UIDMapInUserNS(uidmap []user.IDMap) bool {
-	return false
-}
-
-// GetParentNSeuid returns the euid within the parent user namespace
-// Always returns os.Geteuid on non-linux
-func GetParentNSeuid() int {
-	return os.Geteuid()
-}