switch back from golang.org/x/sys/execabs to os/exec (go1.19)

This is effectively a revert of 2ac9968401, which
switched from os/exec to the golang.org/x/sys/execabs package to mitigate
security issues (mainly on Windows) with lookups resolving to binaries in the
current directory.

from the go1.19 release notes https://go.dev/doc/go1.19#os-exec-path

> ## PATH lookups
>
> Command and LookPath no longer allow results from a PATH search to be found
> relative to the current directory. This removes a common source of security
> problems but may also break existing programs that depend on using, say,
> exec.Command("prog") to run a binary named prog (or, on Windows, prog.exe) in
> the current directory. See the os/exec package documentation for information
> about how best to update such programs.
>
> On Windows, Command and LookPath now respect the NoDefaultCurrentDirectoryInExePath
> environment variable, making it possible to disable the default implicit search
> of “.” in PATH lookups on Windows systems.

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

runtime/v2/runc/manager/manager_linux.go

@@ -21,6 +21,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"os/exec"
 	"path/filepath"
 	goruntime "runtime"
 	"syscall"
@@ -39,7 +40,6 @@ import (
 	"github.com/containerd/containerd/v2/runtime/v2/shim"
 	runcC "github.com/containerd/go-runc"
 	"github.com/containerd/log"
-	exec "golang.org/x/sys/execabs"
 	"golang.org/x/sys/unix"
 )
 

runtime/v2/shim/util.go

@@ -24,13 +24,13 @@ import (
 	"io"
 	"net"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"time"
 
 	"github.com/containerd/ttrpc"
 	"github.com/containerd/typeurl/v2"
-	exec "golang.org/x/sys/execabs"
 
 	"github.com/containerd/containerd/v2/errdefs"
 	"github.com/containerd/containerd/v2/namespaces"