Replace deprecated ioutil

Package `io/ioutil` was deprecated in golang 1.16, preventing podman from
building under Fedora 37.  Fortunately, functionality identical
replacements are provided by the packages `io` and `os`.  Replace all
usage of all `io/ioutil` symbols with appropriate substitutions
according to the golang docs.

Signed-off-by: Chris Evich <cevich@redhat.com>

pkg/checkpoint/checkpoint_restore.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	metadata "github.com/checkpoint-restore/checkpointctl/lib"
@@ -26,7 +25,7 @@ import (
 func CRImportCheckpointTar(ctx context.Context, runtime *libpod.Runtime, restoreOptions entities.RestoreOptions) ([]*libpod.Container, error) {
 	// First get the container definition from the
 	// tarball to a temporary directory
-	dir, err := ioutil.TempDir("", "checkpoint")
+	dir, err := os.MkdirTemp("", "checkpoint")
 	if err != nil {
 		return nil, err
 	}

pkg/checkpoint/crutils/checkpoint_restore_utils.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -237,7 +236,7 @@ func CRRuntimeSupportsPodCheckpointRestore(runtimePath string) bool {
 // given checkpoint archive and returns the runtime used to create
 // the given checkpoint archive.
 func CRGetRuntimeFromArchive(input string) (*string, error) {
-	dir, err := ioutil.TempDir("", "checkpoint")
+	dir, err := os.MkdirTemp("", "checkpoint")
 	if err != nil {
 		return nil, err
 	}