io/ioutil has already been deprecated in golang 1.16, so replace all ioutil with io and os

test/utils/harness/harness.go

@@ -17,7 +17,6 @@ limitations under the License.
 package harness
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -56,11 +55,11 @@ func (h *Harness) Close() {
 	}
 }
 
-// TempDir is a wrapper around ioutil.TempDir for tests.
+// TempDir is a wrapper around os.MkdirTemp for tests.
 // It automatically fails the test if we can't create a temp file,
 // and deletes the temp directory when Close is called on the Harness
 func (h *Harness) TempDir(baseDir string, prefix string) string {
-	tempDir, err := ioutil.TempDir(baseDir, prefix)
+	tempDir, err := os.MkdirTemp(baseDir, prefix)
 	if err != nil {
 		h.Fatalf("unable to create tempdir: %v", err)
 	}