chore: remove refs to deprecated io/ioutil

dump_test.go

@@ -2,7 +2,7 @@ package lua
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -45,11 +45,11 @@ func TestUndumpThenDumpReturnsTheSameFunction(t *testing.T) {
 		t.Error("unexpected error", err, "with testing dump")
 	}
 
-	expectedBinary, err := ioutil.ReadFile(binary)
+	expectedBinary, err := os.ReadFile(binary)
 	if err != nil {
 		t.Error("error reading file", err)
 	}
-	actualBinary, err := ioutil.ReadAll(&out)
+	actualBinary, err := io.ReadAll(&out)
 	if err != nil {
 		t.Error("error reading out bugger", err)
 	}

io.go

@@ -3,7 +3,6 @@ package lua
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 )
 
@@ -231,7 +230,7 @@ var ioLibrary = []RegistryFunction{
 	{"read", func(l *State) int { return read(l, ioFile(l, input), 1) }},
 	{"tmpfile", func(l *State) int {
 		s := newFile(l)
-		f, err := ioutil.TempFile("", "")
+		f, err := os.CreateTemp("", "")
 		if err == nil {
 			s.f = f
 			return 1

os.go

@@ -1,7 +1,6 @@
 package lua
 
 import (
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"syscall"
@@ -130,7 +129,7 @@ var osLibrary = []RegistryFunction{
 		return 1
 	}},
 	{"tmpname", func(l *State) int {
-		f, err := ioutil.TempFile("", "lua_")
+		f, err := os.CreateTemp("", "lua_")
 		if err != nil {
 			Errorf(l, "unable to generate a unique filename")
 		}