Remove deprecated ioutil calls

diskv.go

@@ -5,7 +5,6 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"math"
 	"os"
 	"strings"
@@ -353,7 +352,7 @@ func NewDiskVCellStore() (CellStore, error) {
 		buf: bytes.NewBuffer([]byte{}),
 	}
 
-	dir, err := ioutil.TempDir("", cellStorePrefix+generator.Hex128())
+	dir, err := os.MkdirTemp("", cellStorePrefix+generator.Hex128())
 	if err != nil {
 		return nil, err
 	}

file_test.go

@@ -3,7 +3,6 @@ package xlsx
 import (
 	"encoding/xml"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -874,7 +873,7 @@ func TestFile(t *testing.T) {
 
 	// We can save a File as a valid XLSX file at a given path.
 	csRunO(c, "TestSaveFile", func(c *qt.C, option FileOption) {
-		tmpPath, err := ioutil.TempDir("", "testsavefile")
+		tmpPath, err := os.MkdirTemp("", "testsavefile")
 		c.Assert(err, qt.IsNil)
 		defer os.RemoveAll(tmpPath)
 		f := NewFile(option)
@@ -970,7 +969,7 @@ func TestFile(t *testing.T) {
 
 	// We can save a File as a valid XLSX file at a given path.
 	csRunO(c, "TestSaveFileWithHyperlinks", func(c *qt.C, option FileOption) {
-		tmpPath, err := ioutil.TempDir("", "testsavefilewithhyperlinks")
+		tmpPath, err := os.MkdirTemp("", "testsavefilewithhyperlinks")
 		c.Assert(err, qt.IsNil)
 		defer os.RemoveAll(tmpPath)
 		f := NewFile(option)

lib.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"path"
 	"path/filepath"
 	"regexp"
@@ -1281,7 +1280,7 @@ func truncateSheetXML(r io.Reader, rowLimit int) (io.Reader, error) {
 // When sheets are truncated, most of formatting present will be not right, but all of this formatting
 // is related to printing and visibility, and is out of scope for most purposes of this library.
 func truncateSheetXMLValueOnly(r io.Reader) (io.Reader, error) {
-	sheetXML, err := ioutil.ReadAll(r)
+	sheetXML, err := io.ReadAll(r)
 	if err != nil {
 		return nil, err
 	}

sheet_test.go

@@ -4,7 +4,7 @@ import (
 	"archive/zip"
 	"bytes"
 	"encoding/xml"
-	"io/ioutil"
+	"io"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -421,7 +421,7 @@ func TestSheet(t *testing.T) {
 			if f.Name == "xl/styles.xml" {
 				rc, err := f.Open()
 				c.Assert(err, qt.Equals, nil)
-				obtained, err = ioutil.ReadAll(rc)
+				obtained, err = io.ReadAll(rc)
 				c.Assert(err, qt.Equals, nil)
 			}
 		}