refactor: move from io/ioutil to io and os package (#1772)

The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

pkg/sqlite/setup_test.go

@@ -8,7 +8,6 @@ import (
 	"database/sql"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"testing"
@@ -381,7 +380,7 @@ func testTeardown(databaseFile string) {
 
 func runTests(m *testing.M) int {
 	// create the database file
-	f, err := ioutil.TempFile("", "*.sqlite")
+	f, err := os.CreateTemp("", "*.sqlite")
 	if err != nil {
 		panic(fmt.Sprintf("Could not create temporary file: %s", err.Error()))
 	}