multi: replace ioutil.WriteFile

kvdb/backend.go

@@ -9,7 +9,6 @@ import (
 	"encoding/binary"
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"time"
@@ -235,7 +234,7 @@ func updateLastCompactionDate(dbFile string) error {
 	byteOrder.PutUint64(tsBytes[:], uint64(time.Now().UnixNano()))
 
 	tsFile := fmt.Sprintf("%s%s", dbFile, LastCompactionFileNameSuffix)
-	return ioutil.WriteFile(tsFile, tsBytes[:], 0600)
+	return os.WriteFile(tsFile, tsBytes[:], 0600)
 }
 
 // GetTestBackend opens (or creates if doesn't exist) a bbolt or etcd