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/user/user.go

@@ -2,10 +2,10 @@ package user
 
 import (
 	"bufio"
+	"errors"
 	"fmt"
 	"io"
 	"os"
-	"os/user"
 	"strconv"
 	"strings"
 )
@@ -16,6 +16,13 @@ const (
 )
 
 var (
+	// The current operating system does not provide the required data for user lookups.
+	ErrUnsupported = errors.New("user lookup: operating system does not provide passwd-formatted data")
+
+	// No matching entries found in file.
+	ErrNoPasswdEntries = errors.New("no matching entries in passwd file")
+	ErrNoGroupEntries  = errors.New("no matching entries in group file")
+
 	ErrRange = fmt.Errorf("uids and gids must be in range %d-%d", minId, maxId)
 )
 
@@ -29,28 +36,6 @@ type User struct {
 	Shell string
 }
 
-// userFromOS converts an os/user.(*User) to local User
-//
-// (This does not include Pass, Shell or Gecos)
-func userFromOS(u *user.User) (User, error) {
-	newUser := User{
-		Name: u.Username,
-		Home: u.HomeDir,
-	}
-	id, err := strconv.Atoi(u.Uid)
-	if err != nil {
-		return newUser, err
-	}
-	newUser.Uid = id
-
-	id, err = strconv.Atoi(u.Gid)
-	if err != nil {
-		return newUser, err
-	}
-	newUser.Gid = id
-	return newUser, nil
-}
-
 type Group struct {
 	Name string
 	Pass string
@@ -58,23 +43,6 @@ type Group struct {
 	List []string
 }
 
-// groupFromOS converts an os/user.(*Group) to local Group
-//
-// (This does not include Pass or List)
-func groupFromOS(g *user.Group) (Group, error) {
-	newGroup := Group{
-		Name: g.Name,
-	}
-
-	id, err := strconv.Atoi(g.Gid)
-	if err != nil {
-		return newGroup, err
-	}
-	newGroup.Gid = id
-
-	return newGroup, nil
-}
-
 // SubID represents an entry in /etc/sub{u,g}id
 type SubID struct {
 	Name  string