all: replace uses of ioutil with io and os (#24869)

crypto/crypto_test.go

@@ -20,7 +20,6 @@ import (
 	"bytes"
 	"crypto/ecdsa"
 	"encoding/hex"
-	"io/ioutil"
 	"math/big"
 	"os"
 	"reflect"
@@ -182,7 +181,7 @@ func TestLoadECDSA(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		f, err := ioutil.TempFile("", "loadecdsa_test.*.txt")
+		f, err := os.CreateTemp("", "loadecdsa_test.*.txt")
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -203,7 +202,7 @@ func TestLoadECDSA(t *testing.T) {
 }
 
 func TestSaveECDSA(t *testing.T) {
-	f, err := ioutil.TempFile("", "saveecdsa_test.*.txt")
+	f, err := os.CreateTemp("", "saveecdsa_test.*.txt")
 	if err != nil {
 		t.Fatal(err)
 	}